Confluence Roadmap Planner - Markers Bug

If you create more than 5 Markers and are viewing by week the markers will go off track by one week after the 4th or 5th one.

It looks fine while editing but when you go to preview or save you will notice that line 4 and all future lines will pull in one week. Just label the markers 1, 2, 3, 4, 5. Put bars in between (1-2, 2-3, 3-4, etc) Then save and you'll see gaps. I attached screen shots.

We are on Confluence 5.8.9. It does not matter if I use Chrome or Safari.

Thank You!