Confustion regarding Custom Theme

I'm a little bit confused, after reading other post custom-theme-for-category.

Here is the situation:
I set the "Vintage" theme as my default theme.
I set a new folder:mySite>templates>myTemplate>html>com_eaasyblog>themes>myCustomTheme>blogs>entry
To that folder I copied two files from the Wireframe>blogs>entry folder: default.php, fields.php
and modified them to render the custom fields in a different location and structure.

It works fine per post, but when I added the "Most Popular Posts" module, when the module is rendered in a page with a post under the custom theme, the cover images of the popular post are gone. If I only set the category theme back to one of the core themes, the module renders the images correctly.

I tried to remove the files completely and leave an empty custom theme folder, assuming that if there is no file, it will pull the files from the original wireframe folder, but the problem stile persists.

So:

In the linked thread I pointed at the beginning, you mentioned something about style which should be copied as well, but I'm not sure which file. From the Wireframe? From the Vintage? and way at all if the post was rendered as expected (while setting the styles from the main original custom.css file of my template.


Is there a bug in the combination of the module and the theme override? Should I add another file to the custom theme folder?