How do I prevent the spring arm's camera lag from not modifing the mouse input?

Hello, first question of many since I’m new to UE4 haha.

I have a problem in the game I’m developing right know, it’s a top-down game in which u’re controlling a tank’s head yaw rotation by moving the cursor in the XY plane, pretty simple. (It’s with learning purposes)
I think the problem relies in the screen “modifing” the mouse input when camera lag is active.
I don’t know why but when I turn on the camera lag from the spring arm that holds the player camera, the cursor goes with the screen and it remains unresponsive to the mouse input (it seems like mouse cursor goes somewhere else) until the camera finally reaches the player again when lag finishes.
Mouse input works fine when camera is still (camera lag not active).
It’s probably something obvious but I can’t figure out what could be, I did some research but found nothing.

Thanks in advance.