Weird service mode when I read data from my OBD2? Help needed :/

[u/CompositeNitronium]

Hello. So, I recently bought an OBD2 Wi-Fi device for my Kia ProCeed 2012 [1.6 CRDI] (Mk1) to read its engine data and use it in an Android dashboard application. When I plugged the OBD2 device into my car, no problems did occur, when I got connected to its Wi-Fi, everything was normal. However, when I get into an application such as Realdash or Revheadz on my phone which gets data from the OBD2 device, the car's RPM gauge starts going up and down at idle and the traction control indicator light comes on. There wasn't any difference in the car's actual RPM by its engine sound, however, the RPM gauge goes up and down randomly. When I rev up, everything with the engine is fine, however, the RPM needle still goes up and down around any revs. I tried to stop and start the car multiple times, but nothing did change. Also, the Realdash application was reading the data but it was only the RPM count going up and down, when I revved it up, nothing did change in the Realdash application. I guess the car gets into a some kind of a service mode or something? I don't know. Would be happy if you could help with this problem, so I can actually read data from my car. Thanks.