Marker disappears in Line and stacked column chart...

I have a report with Line and stacked column chart. I have placed time dimension on shared axis, and placed count on Line values. I have set line values to appear as marker. The issue is markers get disppear when I drill up report to year level, every thing is fine when I drill down report to quarter and month level, but when I drill up report to year level markers get disappeared. I tried even to set stroke width to see if appearing lines will show markers, but even them markers were disappearing at year level.

I got some help form community and set Type for X axis as categorical, after that the issue was resolved, but to me its weird to see my markers disappearing at year level.

Month LevelQuarter LevelYear Level with Marker onlyYear Level with Line and Marker