Picture replaced by another picture

So from time to time, when I see a meme or a funny picture, I add it to my Photos library for later reference. I went looking for one today and I couldn't find it. What I did find was another picture I saved appearing twice. I think this has happened before.

So I'll have Image1 and Image2, then at some point Image2's picture becomes the same as Image1.

I tried restoring the oldest version of my library from Dec 2022, but it's the same in that one.

Is this something other people have encountered and do we know what causes it?