Steps I took to fix the issue:
1: Put the rig in object mode.
2: apply the scale (CTRL A, scale)
3: apply the scale to your man
4: Turn on face orientation: You’ll see the man’s legs, the problem area, are red, which means they’re facing in, which is likely what’s causing your problem.
5: Put the man in edit mode, then select everything and reset the normals. (Alt N: recalculate outside)
6: Reparent with automatic weights
