My RIR Phillie is 5 months old. She's always been behind the other chickens in every way. She's smaller, feathered in funny, very quiet, not social with the other chickens etc. I noticed recently she walks funny. It's kind of like a hoppy limping but she is still very quick. I managed to corral her today and gave her a good look over. I saw no vent issues, no sign of anything wrong with her feet or legs like bumblefoot. I did notice her butt fluff has a lot of pin feathers and half developed feathers. I read molting can cause chickens to act funny, walk funny but she's so young. I don't know if juvenile molt can cause these movement issues. I'm thinking maybe the pin feathers she has around her butt fluff might be causing her discomfort so she's walking funny. I stood at the patio and like always she was last to come running and as I watched her she seemed to run in a zig zag. When she stands she also seems slightly lopsided. I was thinking maybe her slow growth was something to do with a spine issue or other deformity that's just now becoming more evident as she gets bigger. Any ideas as to why she may be moving so strangely?