Strange Behaviour of vertical grid in Waveform Graph

[Quiztus2]

I am running the latest LabVIEW version and lately I see strange behviour of Intensity Graph and Waveform Graph with changing data.
I don't see why the vertical grid lines don't appear here?
The vertical grid lines exist, if I set u_3[px] to 587.

Why is the grid spacing not 0.5 here, but 0.4?

Writing 0.5 to X-Scale: Increment doesn't change the outcome.

 

 

[Quiztus2]

It turns out that if you overwrite the xmarkervals[] once, the autoscale option doesn't overwrite these values.

You have to make sure that marker spacing is set to uniform in order to have the default behaviour back.