I have weird bug, teleport doesn't work if I push W+A(up,left), WD, AS,SD works. Is it bug or some keyboard problem?

You can test it by choosing other keys to those directions. If the thing still happens, it is a bug. If it disappears, it is your keyboard.

------------------

Otherwise some notes on teleport:

The teleport works in a weird way as far as I noticed.

1) if you press no direction-button, the teleport brings you towards the mouse-cursor
2) if you press any of the directions, the teleport will bring you in THAT direction

Other issues with teleporting aside in the heat of battle you can't stick to that confusing method:
- some maps are designed to teleport from exact places, because of distance-issue. These work poorly, as it many times this results in pixel-hunting, aka. nothing happens when you try to teleport because the program says you'd teleport into a wall. It is just Poor Design Choice.