cannot see trendlines
 

I have a graph with 6 series. There is a primary and a secondary X
axis.

I want trendlines (moving average) on all data series. The chart will
not show any. No error messages, go through procedure of adding
trendline, but it just doesn't show up. Search for hidden line with
cursor, doesn't show.


The trendlines show up in the legend whether or not they show up on the

chart.
Scaling is automatic, and there is space above and below the data curve.