AFCI & IR Cameras

I see very few AFCI’s installed in my area. Three times in the past month however I’ve run into them in newer houses (2-4 years old). Each time I’m doing an IR scan for buyer and each time the AFCI breakers were showing way hotter than everything else in panel … Got any idea why??

They’re electronic devices, not just breakers. It’s normal for them to produce heat.