Pixelfed posts with 5 or more photos cropped in weird dimention when logged in via Pixelfed account

Phanpy displays the full amount of photos from the post when logged into via Pixelfed but depending on the screen width crops them to a strange dimension.

post in question: https://pixelfed.social/p/Lacalle/684124192137313050

the view from the search screen page (attached below) looks quite fine to me with adding ``4+`` on the forth photo and then loading the lightbox on click

tested on dev.phanpy.social ([version](https://github.com/cheeaun/phanpy/commit/c3bcf3d))
Firefox 124.0.2 (64-bit)
macOS 13.6.4

Reproduce the Pixelfed post from the linked URL on dev.phanpy.social at several screen widths, then compare its regular post view with the search screen behavior shown in the issue. Done means posts with five or more photos no longer crop to a strange dimension, while the photo count indicator and lightbox behavior remain usable.

Written by the indexing model from the issue text.