Three-speed hub on Mobike bicycles

I rode one of these Mobike bicycle-sharing bikes a couple of days back when I was doing some errands in town and I do not know if Mobike set up these bikes properly or not. There are three-speed Shimano Nexus hubs on these Mobike bikes and every one I have used has some issue or other with it. Some of the Mobikes I have tried have only two gears that can be engaged, not three. The one I used a couple of days back kept skipping and skipping. It is pretty dangerous for a rider who stands up and pedals as that skipping may cause him or her to lose balance. In any case, I filed a case with Mobike. Let us hope they fix it.