As an observer with noconnection with airfield ops...
Stand 2A is in more or less the same position as Stand 2 - but at a different angle towards the terminal. It was regularly used by Flybe BAE146 aircraft - which are not now regular visitors on scheduled flights. A 146 could not park on stand 2 as it would infringe the taxiway. A different angle and hey presto! She fits!
Not sure about the dashed centreline though. I think they may indicate offset or alternative parking positions. I think they may also indicate that they will not accomodate a "drive-through" taxi position. I'm sure someone will confirm or deny. Or even both!