so we are talking about packages you’ve installed from aur. with all the problems and discussions about manjaro/pamac/aur the only thing i would suggest is to switch to unstable, renew the pamac/pacman as described in the unstable thread and use this.
that’s my personal point of view, others might think different.
Since I never changed the mirror list, I don’t think it’s different. But, thinking about it, the OS installs were done a few months apart. So, that might make them different.
But, Now I’m really confused because I removed the package in question on the machine that Pamac says has no updates. It reinstalled it and now it is at the same version as the one that updated on the other machine.
If you want to ensure your mirrorlist is never rewritten you should create a custom mirror pool with only one mirror e.g. - select the same mirror for both systems
sudo pacman-mirrors -c at -i
Then update from the official repo
sudo pacman -Syu
After a succecful update you can rebuild your AUR package(s)