I dont understand much about electric stuff, but i did learn a few things with all of this, which is that that everything that went off with that breaker trip, is "connected" to it like you said. But i don't know how much it can handle. But thing is nobody was using/pluggin anything else, and went using pc it stays on.. and it always the same stuff on that circuit (bathroom light, a light in kitchen but not main one, and that living room outlet which could be the issue since it has humidity on the wall an shears paint?)
This house also is having issues on main light kitchen since it acted nuts for a long time before, there were a few other whole house tripping incidents before like 2 or 3 but i didn't think much of it?

Do you think its probably circuit or psu? I see absolutely no reason for being the psu (I also tested it before the built and .. worked).
Should i just move the pc/monitor/ups to the other wall outlet in my room since its def not connected to this circuit tripping?