Chain and free hub jumping when rolling bike backward

Hi all. I’ve just taken out the rear wheel and reinstalled again after mounting rack and fenders. I Just noticed that when I rolled the bike backwards, the chain and free hub cogs are jumping around. There’s no issue whatsoever when rolling forward and coasting. Everything is installed correctly and there’s no rub on the chain tensioner, brake pads or anything. Wondering if anyone else has had this happen and if they have found a solution.