Gfci Circuit

gaurdian generator gfci problems?
i have a customer that purchased a guardian generator 8000 watt electric start. i installed a 10 circuit reliance transfer switch to the panel, when we plug in the generator, the GFCI circuit of the generator trips. i was told by the transfer switch company that this generator is for site use, and not for residential standby power and that is why it trips. and there could be a way to bypass this gfci. generac is tough to get a hold of their tech support, so any help to get this resolved would be great. thanks in advance.
this generator is a portable type, but i wired the house a few years back, and the grounding is fine, i am a licensed electrical contractor, just having problems with this generator. i ahve done many in the past and no problems what so ever. this is just an oddball thing.
thanks for the answer tho.
Is the panel grounded to an 8 foot grounding rod, that was hammered into the ground and then braze connected to 6 gauge stranded copper wire with that ground also clamped onto the main cold water source pipe’s bare metal?
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