funny sleep position

hi mamas! my little one just turned three months old today and has been rolling over tummy to back since about 2.5 months old. recently ive noticed that when putting him to sleep he will often get into this position, which freaks me out because it looks so uncomfortable and swing his leg over like he's trying to roll back to front. has any other mama's had or have this happen to them?

of course i googled, which a first time mom with horrendous anxiety should never do, but i found a lot of other moms have had this happen to them?

cause for concern or normal?