Opening Inventory while using WASD movement

When I'm using WASD Input Method, and pressing WD to move top right direction or pressing SD to move bottom right direction, I cannot open Inventory UI using Inventory default 'I' key bind.

Inventory panel does come up normally when moving WA and AS

Might be a keyboard issue?

Try using this for an explanation of Key Rollover, and to test if that is the cause of your issue.