1095-a reduces my refund by around $900.. why is this?

Covered under affordable care act through market place. Policy issuer is BCBS.

Info: 

Part 3 

Box A: 311.29 | Box B: 335.16 | Box C: 311.29

Had this policy from January until June then moved over to my new jobs insurance. Not sure why this is wanting me to pay anything back?