Ashtanga and 26+2 cause opposite feelings in the body.

I’ve been doing ashtanga regularly for a year now, it makes me feel stable, confident and prepared for the rest of my day. I’ve recently started doing Hot Yoga, my studio offers Fierce Grace classes and I am surprised that I find it so stressful. I feel anxious throughout the class and struggle to be present.

I initially thought it was the heat but my ashtanga classes also use infrared heat lamps that i position my mat directly under.

Do any of you much wiser beings have any idea what could be going on here?