Pamac has it’s know issues. it’ll tell you there are updates even when you’ve Already done them (your case), it won’t pick / list up all updates, for those that attempt to use Pamac for actually updating it can error out from time to time but doing those same updates via terminal they install just fine, after adding custom repos and choosing to refresh repos in Pamac it it can tell you database error when there actually is no error. I stick to the terminal for updating. So I can update everything all at once I install topgrade. For looking for individual packages I install Pacseek which can be run from the terminal.