Too many columns in Values Bucket in Custom Visual

We are facing "Too many columns in values bucket" error in custom visual. We have created custom visual which allows us to drag 100 coulumns, however, we are still facing the issue after dragging 68 columns. 

Note: We are not facing this issue on Power BI Desktop. It is only on the Power BI Service and that too only on initial login for the day. From the second time it is working fine without error.