I guess you should review what settings you have on your gateway. Two in particular come to mind: the sync word and of course the channel map.
Did you pick channels 0-7 to match your known configuration?
Channels 0-7 match these frequencies:
channel 0: 902300000 hz min_dr 0 max_dr 3
channel 1: 902500000 hz min_dr 0 max_dr 3
channel 2: 902700000 hz min_dr 0 max_dr 3
channel 3: 902900000 hz min_dr 0 max_dr 3
channel 4: 903100000 hz min_dr 0 max_dr 3
channel 5: 903300000 hz min_dr 0 max_dr 3
channel 6: 903500000 hz min_dr 0 max_dr 3
channel 7: 903700000 hz min_dr 0 max_dr 3
I think these are actually unusual in US installs (for example TTN doesn’t use them)