Why do my album covers change on my phone when imported from iTunes?

Found an issue with the music on my phone (iPhone 13, replaced this past fall) - missing most of the tracks on a lot albums. I had to replace my laptop about the same time, spending weeks getting it corrected, and didn't realize that my iTunes had no music. Seems because my music are my cd's ripped into my computer and not purchased nor downloaded, that iTunes would not sync between the old and new laptop. Spent the last 4 days updating, replacing massive amount of missing tracks (iTunes tends put "track 1", never with any info, into it's own album on about half of the albums or just not even including it), getting album artwork correct per album. I really want the artwork so when driving, I can just look at the cover to pick the next album. (I try to not to do this but sometimes it happens.) I finally synced the corrected iTunes to my phone. Yes, everything was updated prior to the sync. There are barely any correct album covers! This has been an ongoing issue but since I know that iTunes is correct, and this it the first time this phone has been physically synced to iTunes, I did not expect issues. Needless to say, I am so peeved. It seems to be a constant issue. I'll probably be deleted every album with an incorrect cover at this point. Does anyone have any idea why this happens? Is there something I'm doing incorrect when syncing? I check mark each individual album and nothing else. I'm soon going to be back to using cd's in my car. Thanks to everyone.