I have an iPhone 12 Pro (up-to-date with 15.4.1). I just noticed today that when I click on the Manage backups button, it only shows me the back up I just made. Same with if I click on restore backup. I had made a backup yesterday April 26 but it was not there. Then I went to About This Mac > Storage>Manage and the only IOS file shown there was from a few days earlier.
After making the first backup today, I made a second one. Again, Manage backups only shows the second backup I made, not the first.
When I go to ~/Library/Application Support/Mobile Sync/Backup, there is a folder there containing 261 items, all the folders are dated Today at 1:11 PM. That would have been the second backup.
I have my backups set to be on the Mac, not the cloud.
I am running Monterey 12.3.1. on a iMac 27-inch 2019.
I also use iMazing to backup my phone every day…conflict there maybe? iMazing shows my previous backups that i have not deleted yet.
Cocktail app maybe? I run it every night before shutting down. I noticed under the User tab, there is an option to clear iOS backups and software updates, but it is not checked on, and I have never turned it on. Aside from a couple of tweaks to the Internet tab, all the other options are set to default.