"Bar" in calender view "stuck"

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I have a bunch of projects wheras each projects has its own start and stop date. When I plan each project I normaly use the calander view in the gantt plan to move the project start date around. But these last days it seems that there is a lag in smartsheet. Meaning that when I move a bar, lets say one week forward, the start date in the left view does change correctly, but the bar i visually stuck in calander view. The "bar" does not move before I save and refresh the page.

I have tried both Chrome and IE and also my collegue has the same problem.

Does anyone have an Idea what is wrong`?

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