Spring arm camera lag ISSUE

Please can someone help me I have posted this so many places and nobody replies or even tries to help.

When I use high values for the camera rotation lag in spring arm, it introduces camera ROLL when you move the mouse diagonally even if roll is not ticked.

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This is replicatable in a new first person project.

Here is a demonstration of my problem:

As you can see if I move the mouse horizontally it works, but when the mouse is moved diagonally the camera rolls and it’s really frustrating because I am using this for a cinematic camera in my game.

ANY help would be valuable thanks!