Issue with Time Shift

Hi all,

I'm trying to have a time shift bar graph in a month to month comparison. I'm looking to have the record count of the current month compared to the record count of the previous month. Ideally, the visualization should show that the previous month should match the record for the current month the point before (i.e. the values for May should be the same regardless if it is the current or previous month). But this isn't the case.

Any ideas on how to fix?

Thanks!