Wobbly Windows gets deactivated – Kubuntu 18.04

Wobbly Windows gets deactivated - Kubuntu 18.04

Allo all,
I have 3 PCs with different hardware. Same OS Kubuntu 18.04.
On one of them Wobbly Windows Effect continues to work.

On the 2 others, no.
The checkmark next to Wobbly Windows is still there.
If I uncheck and click Apply at the bottom. If I recheck and press apply, nothing changes.

I am using nvidia-driver 455

Code:glxinfo | grep OpenGL
--------------------------------------
OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: GeForce GTX 980/PCIe/SSE2
OpenGL core profile version string: 4.6.0 NVIDIA 455.38
OpenGL core profile shading language version string: 4.60 NVIDIA
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 4.6.0 NVIDIA 455.38
OpenGL shading language version string: 4.60 NVIDIA
OpenGL context flags: (none)
OpenGL profile mask: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.2 NVIDIA 455.38
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20
OpenGL ES profile extensions:~~~~vmelkon