Problem with Pivot Table

Hello everyone,

I am experiencing some strange behaviour using dhis 2.20.

I am looking at some data and making a pivot table. I select all of the weeks in a particular year, and the table is made no problem. If I make a new table for all the weeks in another year, that is also OK. BUT, if I make a table with the weeks from both those years, I get a blank table. Has anyone ever seen this? Even stranger, if I add on a relative period to the table along with the weeks from the 2 years, the table displays all the data. It seems to only not work if I am selecting all the weeks from more then one year together.

I realize you may need some more info, some please let me know what might help.