Favorite image filter is occasionally non-consistent

[LastZolex]

While I used the favorites function not very often yet, I am currently exploring its advantages and already love it ;)
But when working on my images today, I stepped on this problem when trying to filter a large amount of images for just a few favorites.

The test case:

• 1477 images in total, 7 of them marked as favorite.
• All images are text2img renderings.

The result on the UI looked like the following linked picture, after choosing the option "show favorited":

• https://ibb.co/RHx42fD

Did I do something wrong here, or is it possibly a flaw due to the number of images to filter?

PS: sorry for linking the image via imgBB, but my current work environment blacklisted uploads to Gi tHub :(
PPS: I am allowed now to upload images to github, finally ;)