I would agree with franklin2 on this
GFI outlets are rated at say 15 amps because of the size of internal wiring/contacts not because they act as a circuit breaker, same as regular outlets are rated at 15 or 20amps
AC voltage works by cycling voltage from + to - , at say 60 times a second, this moves the electrons back and forth creating usable power for a device
DC voltage just moves the electrons in one direction
Not super accurate description, but good enough for this
GFI works, trips, if more electrons are moving on one wire vs the other, which can only happen when there is an imbalance in the load, electrons flowing out but not on the monitored wires, a leak in the system, lol
Higher flow back and forth but equal, high amp draw, shouldn't cause GFI to trip, but should cause circuit breaker to heat up and trip
A poor connection on GFI or at breaker panel, or if there is a splice in a Junction box, these could cause higher amp draw, and trip breaker