I think I don't fully understand the problem. Is it showing only with EasyTheme enabled or due to some other 3rd party plugin you use? Have you modified any plugin/Easytheme or does the problem show with unmodified plugin code already? Can you post an image to show what it looks like? You might also want to try with 3rd party plugins temporarily disabled to see if the problem is gone then and then enable then one at a time again to narrow it down to one plugin (if a plugin is causing the problem). It's quite difficult to give any more specific advice otherwise.

I've just tested myself and it works fine for me. I've tested on Elgg 2.3.6 with the latest version of Easytheme2 available here on the community site with default plugin settings and default images and with the latest version of Tidypics (2.3.4 - currently only available at https://github.com/iionly/tidypics/releases as I have trouble uploading it here on the community site). But I wonder why Tidypics should cause the trouble anyway. The screenshot shows the activity page and shouldn't be influenced by Tidypics.

Question is if you might have problems due to some other plugin(s) (at least on the activity page) that adds the wire functionality. Is it hypeWall? Have you tried to place this plugin below the Easytheme plugin if it's not already placed below? What about the dimensions of the header image? Are they exactly as the Easytheme plugin requires, i.e. exactly 1240px wide?

Hello,
yes I use hypewall above or below it's the same

the size of the image is 1238 x 369 pixels (3.36)

I've tested again - even with the header image from your site - and it works without issues for me. I also added hypeWall for testing and it still works fine.

Are you sure that you are using the newest available version of all plugins you have installed?

Have you tried with all 3rd party plugins (except Easytheme2) disabled and then enable one plugin after one plugin again? Is it really only Tidypics that causes the problem, i.e. if you have all 3rd party plugins disabled and then enable only Tidypics and Easytheme2, do you already have the problem? And the other way round, do you have any problem with all plugins except Easytheme enabled?

I could just say again that it works fine for me. But this won't help you and it also wouldn't help me getting any new ideas why it doesn't work for you. So, we might need to clarify some facts first: which version of Elgg are you using and which version of hypeWall and EasyTheme2 have you installed?

I test with the latest available version, i.e.

hypeWall 5.2.0
EasyTheme2 2.5
Tidypics 2.3.4
Elgg 2.3.7

The situation might be different on an older version of Elgg - where you would also need to use suitable versions of the plugins (as the latest version of the plugins available might not work on an older version of Elgg). But looking more closely at the list of plugins you included in your first posting I got to wonder if the Elgg/plugins versions might explain the trouble. For example, you list hypeFilestore. I think this plugin wouldn't be necessary anymore on Elgg 2.3 with the most recent version of hypeApps as this plugin now contains the functionality of hypeFilestore.

So, my point in short: if you are not on Elgg 2.3 (2.3.7) yet, is updating an option? Have you made sure you use the latest available version of all plugins used on your site (for the hype* plugin better check also at https://github.com/hypeJunction for the latest releases)? Also, make sure not to use any plugin that might no longer compatible with your version of Elgg or no longer necessary (hypeFilestore?).

Or post at least the version of Elgg and the plugins you currently have installed. Then I might at least be able to reproduce the issue (though I might have to suggest you then to upgrade).

"Latest version" is still rather unspecific as it could mean different versions of the plugins for different versions of Elgg and it also doesn't tell if you use the latest version of hypeWall from the github repo (which is newer than the newest hypeWall version from the community site). Why not just list the version numbers of the Elgg version and the plugins?

So, Tidypics is not involved but it's a matter only between Easytheme and hypeWall, right?

Are you testing locally with an unmodified Easytheme with the default images and all other plugin settings left to the default values? If not, you might want to set up an local Elgg installation specifically for testing ONLY with hypeWall and Easytheme as the only 3rd party plugins and with everything unmodified (i.e. no theming changes or anything else) but just using the default settings of the plugins. Do you still have the problem then? As I already told a few times, I can't reproduce your problem at all as everything looks perfectly fine with Easytheme and hypeWall (and also any plugins suggested by hypeWall) installed. So, the problem might be that you have made some change (either directly in code or on the Easytheme plugin settings page) that is faulty for some reason and only becomes an issue with hypeWall enabled.