Jeans are Bunching at the Crotch

What causes jeans to bunch up like this in the crotch area? These are 28” slim jeans from Frame and are the smallest size offered. My guess is either too big in the waist/hips or I need a lower rise. I’ve been wearing Paige skinny jeans, which has a low rise, in the same size for a couple years now without any bunching. I figured I’d give Frame a try since I’m ready to retire the skinnies but don’t love how Paige slim jeans fit. Could a tailor help fix the bunching of the Frame jeans? I really love the softness and color of these jeans.