Is there a limit for photos added to favorites?

Hello, I have been adding favorites for a while and I have noticed that they are being "overwritten" by adding and replacing the oldest photos that I had added, I see that there are accounts that easily have three times as many favorites saved but I can't add more :(

I have 6× the amount of favorites

doubt it im pretty sure I've seen some one with 154k favorites, maybe it's a bug.

No. But there is a bug with seeing the last few (not sure how many, maybe just one) images on the last page in a gallery with a lot of images in it. Sometimes they are missing. This is due to the fact that the number of images is cached for a short time for performance reasons. I remember looking into it a while back and it was surprisingly hard to tackle (while keeping the caching), so I never resolved it. Do you know how many images are missing?