I think this is known issue in tableau. This Behavior occurs on Server only when extra containers are present in the dashboard.
Still i will ask some questions?
Does Issue occurs only on a Dashboard and not a worksheet.
Do you have Containers in the Dashboard.?
The issue in seen in both worksheets and dashboard on the server.
Also, with the dashboard, the issue is seen with or without any containers.
I was able to get around this issue by adding a reference line with out showing the value and it works now.