Heating issues

I am using iPad 11th Gen (A16) and I noticed a weird issue. The top side (near the volume buttons) heats occasionally:

1. If I stream live WC matches on Safari
2. Watch YouTube for a prolonged period in Brave

Conversely, while streaming the Criterion Channel on Safari it is okay. Even the battery consumption is pretty low. If I stream live matches on Brave, it is okay.

I am unable to understand this behaviour because of its aberrant nature. Also, the heating is mild (it’s not burning hot) but compared to the temperature of the pad’s other surfaces it goes up a little.

Does anyone know what this is about? I am a little confused here.