Can't get Di2 rear derailleur any where near position

Recently had a chain jam whilst riding and now while fitting new chain di2 adjustment won't get anywhere near to position. The H adjustment is maybe 3 sprockte inwards from the smallest sporcoket and the L screw is at atleast 1 sprocket inward of the biggest cog. My initial reaction is this is a bent hanger but feels strange that the limit screws won't get near to either the biggest or smallest sprocket! Any ideas?!