Mobile Landscape Orientation switching width with height?

Hello my lovely comUnity)) Today I stumbled upon an interesting problem. I was trying to implement dual joysticks player controller on Mobile devices using Unity standard assets' mobile joystick. So, on PC everything works just perfect, and starting position for joystick (where or should return after drag ended) is the starting position where it was from the beginning. But when I'm testing on my phone (OnePlus 3T) Joysticks change their position drastically after the first drag. I even started new empty project where I used just cube with the standard assets' mobile joystick, and the result was unfortunately the same. So please tell me, where hide the origin of this problem? May be it's just my phone? Or may be I have to change some settings in unity?