Bad radiator caps?

So last week my bike started spilling some coolant from the overflow tube after I park it but only on the afternoon ride home from work. It doesn't do it after the ride in.

Temps are fine, never saw over 212F on the rides home while in traffic and the fans bring it right back down. While moving it's 180F or lower consistently.

I did replace the hoses and coolant over the winter. I filled the system and burped it as per usual and filled the overflow tank to the proper level. The bike was upright on my lift when I filled the system and tank.

I checked it Tuesday afternoon once it cooled off and the radiator was a little overfull and some spilled out when I pulled the cap off. I sucked some out so it was just below the fill neck. I stood the bike up and checked the overflow tank and it was perfectly between the lines.

Someone on one of the FB groups mentioned that Yamaha has had issues with their radiator caps and the FJR's had an issue with them years ago. Seems they never seal well after they're removed for the first time after the factory installation.

I also did some internet searching and found that a bad cap will cause that exact issue as it can't hold the pressure in. It doesn't leak out while riding though and the temps are never higher than normal. Plenty of people on FB saying it's normal too which FFS no, it isn't lol. I've put several hundred miles on the bike since doing the stuff over the winter and it never leaked a drop until last week.

I also cleaned out the cap and sealing surface and I'll see how it goes this afternoon, although it'll only be in the mid 60's today as opposed to the mid to upper 70's it was on the three days it happened.

Anyone else have issues with their cap? They're cheap enough to replace, I'll see how it holds up after cleaning it.