You ran the script that Terry included here? https://community.dynamics.com/gp/b/dynamicsgp/archive/2015/11/25/gpye2015aca
I think this 1095-C issue was fixed with the January hotfix: https://community.dynamics.com/gp/b/dynamicsgp/archive/2016/01/15/microsoft-dynamics-gp-january-hotfix-released
Good luck with the last minute 1095-C scramble! I know it's keeping me up late at night right now as well, so hopefully these 2015 forms will be finished soon (not that this will be end of ACA though...)