The Maronites celebrate Christmas on Dec. 25 as do, to the best of my knowledge, all of the other Eastern Catholic Churches. Does yours celebrate it on Epiphany?
Certain Orthodox hierarchies haven’t yet adopted that new-fangled Gregorian calendar yet. ;) The Julian calendar is 12-13 days off the Gregorian. So by the Julian calendar it’s December 25. You know what they (we!) say about us Orthodox: anything that happens in less than 400 years is done in unseemly haste and hasn’t been thought through carefully enough. :))