Why is my metabolism so high (hardgainer failo)

[Broski]

Guys my metabolism must be severely fucked...Im 5'10 148lbs (low bf%), been on a dirty bulk for 5 months yet my maintenance calories is about 3500 (ive been tracking on MyFitnessPal). Im only gaining about 0.5kg per month. My job I am constantly walking and I'm a drummer, so that could be why my caloric needs are so high? Here's my weight per week. Should I increase my calories or could there be an underlying medical issue? As you can see, my weight is plateauing hard as of the last 2 months. My goal is to be about 160lbs (72kg). It should be noted I am an ecto-mesomorph build and have been following the same PPL split 5-6 days per

week for 5 months.

 

[Sigmamale]

Yeah you probably burn a lot of calories and your maintance is elevated from dirty bulking