One MOSFET appears to get hotter than the other
When one MOSFET is heating up more than the other, it is usually one of two items:


Higher resistance in one leg.


It appears that you have included a 0.5ohm resistor in one leg, therefore, most of the current will go the low resistance route - the other leg.


In switching applications, the diode of one MOSFET is being used instead of simply turning it on during that portion of the cycle.


The diode has ~0.7V drop at the same current whereas if you simply turned on the MOSFET, this would drop to a much lower value, dissipating less power.  This is why there are synchronous power supplies.