Well with my progress of making a custom camera system, stumbled upon this. Camera is all fine, its the billboard guis that freak out with it. Without it, no problems.
But why though is a question i need to figure out.
To see scripts and overall reproduce the issue, here is the rbxl of a baseplate with one billboard gui and the camera system.
[deleted :p]
Bumping since i still havent found a proper solution, and iām really in need of fixing it as it breaks alot in my game.
Tinkering with the script i noticed this.
Disabling the rotation
RunService.RenderStepped:Connect(function()
camera.CFrame = CFrame.new(rootPart.Position + cameraOffset)
end)
Led me to something new, billboard guis happen to be affected by mouse movement. Even though the camera rotation is 0,0,0 at all times!
Gonna continue digging into it, if someone finds anything to fix this, please do.
Turns out the smooth camera script was interfering due to poor implementation of mine, self-solved 
It had to do with tweening the camera toward a target based on cursor movement.
Wherever the cursor moved, it would set the target position, and the camera would tween to that point.
Use:Lerp(), not:Tween()for active camera movement.
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