The reason why people think very heavy lifting makes you 'bulky' is that overeating makes everyone stronger, period! Undereating does the reverse, period! (see my signature below)

So, people like powerlifters (or strongmen or wrestlers etc etc) in higher weight classes for whom strength is far more important than looks, eat way more than they really need and are bear-ish strong as a result.. but also grow both muscles and fat.

Eat at maintenance and you won't get bulky .. undereat and you can't get bulky even when you wanted to..