Trouble with piled columns graph (2 values)

Hi!

I've been having some trouble making a 2-value graph, data type: date/time and recount.

Context: it's a monthly report of a Help Desk that opens and closes tickets on a platform. The graph I mention is 'Open tickets vs Closed tickets', recount per day.

But using the filters in the Filter panel, I 'loose' data: for example, if I'm making the march/2020 report, and I filter the tickets created that month, I'm 'losing' tickets closed in march but created in february or before.

I tried adding new columns, taking only the data I need (meaning, only the tickets open or closed in march/2020), with the following:

But then I had another problem, 'cause when I change the type to 'categoric' (Visualization panel, axis X, Type), a recount of Blank appears, like it's another day of the month.

Lastly, I tried creating 2 different tables (table 1: tickets opened in march/2020, table 2: tickets closed in march), with no blank cells. But it is impossible to visualize that data correctly (I get columns with recounts that have nothing to do with the data).

What solution could this have?

Thanks! 🙂