Mouse-turning stops working after Remove from Parent

Greetings!

So I’m trying to create a very simple ingame menu, which pops up when pressing a key (in this case “R”). I’m using the First-Person Template.

The menu has 3 buttons, where the first 2 either restarts the current level or quits back to a main menu-level (which as of now is just an empty level). These work perfectly, no problem there.

The problem, however, comes when clicking the third button, which I’ve called “Cancel”. This button simply removes the ingame menu from the viewport and let’s the player keep playing the current level. What happens is that if the player shoots a bullet after having viewed the menu, then the ability to turn with the mouse stops working. If the player holds down any of the mouse buttons, it’s possible to turn, but if no buttons are pressed, then no turning is allowed.

What have I done wrong?