sin bug or ?

[Endaethia]

he guys 

During phantom stance after using skill number 4 my RMB F combo stops,so i have to use  the combo again  ( happens when i upgraded to thundercall) which where i lose much dps

is that a bug ? tho its only with game buttons ( simple mode ) 

my mouse works perfect with RMB F 4

if so hope devs fix that