Block on Gantt Chart

Hi, I made a project schedule on Gantt Chart and appeared the black blocks and the blue block on Gantt Chart as screenshoot attached. What do they mean?

Just commenting to let others know, that I want more details on this as well.

This issue is probably linked to the Theme that you are using.

You should try to use KanboardCSS or WeKanboard in my optinion. These themes have less replacements on the code. No bug.