I host a condo in a spread-out, townhouse-style complex on several streets. GPS points to the office of the condo complex, which is nowhere near the actual condo. For this reason, I provide old-style step-by-step instructions for getting to the condo in my Welcome packet, with added verbiage underlined in several places to use the instructions instead of GPS.
I don’t know why your Chinese guests would have a different GPS than everyone else. If you were curious, or wanted to get it resolved so that GPS could be used, you might want to ask your guests what GPS app they are using, and research it from there.