My only guess would be your cell phone and you drone has a different way of interpreting how strong the signal is. Long time ago we had a local cellphone carrier their phones showed 10 bars everywhere you went.
Seem pretty legit to me if you are ok with buying from China. Don't appear to sell drones so not sure why anyone would go thru all the trouble of listing a bunch of parts and accessories for drones. Just use your standard protected payments and...
US residents, if you manage to buy a drone from here, you can rest assured you are not getting a grey market or black market DJI drone but an official drone.
Hint: Both Adorama and B&H as well as the NYC store are on the US authorized list.