I have noticed on at least the last two versions when embedding a media gallery, the last thumbnail is the number of pictures left. It displays fine on desktop, but on mobile devices, it is skewed and not the size on the other thumbnails. See attached.
Thank you for reporting this issue, it has now been resolved. We are aiming to include any changes that have been made in a future XFMG release (2.2.1).
Change log:
Ensure "show more" item in embedded albums has an appropriate default width/height.