I think I see the same behavior.
I bought RV30 plus 2 days ago and did all required initial procedures (map creation, bios update). 
I have not used and have no plan to use mopping feature because it is useless.

Today I found the robot is trying to go through mapped walls. According to displayed progress picture, the current perception of the robot (room map) is rotated 30 degrees relative to the main, base map of the room in memory.

I think it is better to return this robot to the store.

  @mekatu I'm getting the same problem with a brand new 30C. Did you end up finding a solution?

  @Gards 

I have sent the vacuum to Tp-Link for repair. Received it back yesterday with a dispatch note stating that "the mainboard has been replaced".

I reinstalled the vacuum, mapped the home carefully and this morning did the first job. After some minutes I noticed that the map is tilting again. (see the grey tilting on the right bottom corner - circular section)

Once the battery is discharged, it was not able to find the charging dock although it was some meters away from it. It seems that nothing has changed. 

I sent another -email to Tp-Link. Lets see what their response will be. Obviously mainboard replacement did not solve the problem.