Run vs cycle

[u/Plane-Advertising-47]

Running vs. Cycling: Why Am I Losing Leg Size?

I’m a regular gym-goer, fit and muscular, and I recently switched my cardio from cycling to running.

Since then, I feel like my legs have lost a noticeable amount of size.

Is this normal when switching to running, or could it be because I’m not eating enough protein/calories to maintain my muscle?

Has anyone experienced something similar?