I’m guessing you moved images over from your iPhone to the Pixel? I’d have to imagine the timestamp data is incorrect or something after the transfer because they’re all listed in order from newest to oldest for me. If I want something from a specific image folder I just hit the folders button and each folder then lists them just the same. If you look at your image’s details in the Photos app are the dates/times for those images all pretty much the same?
Nope, everything stock. Galaxy Z Fold4. Looks like they’ve got a website though and they let you get it from there.