Mouse + keyboard on series x movement

Whilst moving, any mouse input stops player movement besides fire and aim - lclick + rclick - I have to release and repress strafing keys - wasd - in order to move again whilst still aiming.  An example is when ADS strafing and changing stance with C which is bound to a mouse button, player stops moving meaning there’s not a smooth transition aiming between stances.

When I started the game and went straight into the firing range it was fine, but since rebinding and resetting to default, I can’t seem to find the issue causing this.

I also reset my keyboard and mouse and disconnected, but it was no help. Keyboard is Razer Huntsman Mini and mouse is Logitech Hero Lightspeed