Adding a dynamic title to the Line Chart removes one of the lines defined by the Legend. So if a line chart has to show 3 lines (1 per each category define in the Legend) it actually shows 2. Always ...
farsu436
Advocate I
Advocate II can confirm the same issue is with Stacked Bar Chart, Stacked Column Chart, Clustered Bar Chart, Clustered Column Chart, 100% Stacked Column Chart, Stacked Area chart and others.
This happens only when there is a field assigned to Axis (I use any of the Date fields (week, month or year))