Hey all,
I have Lelit mara x and I think I got a problem that the machine is getting too hot and as a result bubbles form when I make espresso.
Most of the day the machine is on, and it reaches the 100 degree area. Those who know the machine, there are 3 heat modes, I put on zero mode.
Does it make sense for the machine to reach these temperatures?

No, it doesn't. Something is off in the sensor loop.

It does make sense if you have the machine in boiler mode, rather than the X mode, so that the boiler pressure stays constant. But if you have the machine in the X mode, and the boiler pressure is going up and down (up to about 2.5 bar when you first turn it on, down to 0.8 when you idle), then there is a problem. The mode setting is part of the PID panel programming, check your documentation.