Diagonal line at calculated fields

Hey guys,

I got one Dashboard that has 3 calculated values. Problem is, if you zoom really close to it, like a timeline from 4-6h, you will get a diagonal line at the calculated graph(s). The calculated graphs are displaying the value noramally, but also shows a diagonal line. When you are zooming out again, the diagonal line disappears. How can I disable that diagonal line? I tried everything, compared that dashboard with some other dashboards and I can’t find the issue. Every other dashboard works normally with calculated graphs
As a databank I use InfluxDB with Flux.

How it should look:

But how it looks:

Thanks for any help!