Do the measures or dimensions in your view have actual data for the month of February or are they null values?
If there is data for February, then you may be experiencing a known bug in Tableau. See the link below for detailed discussion. I suggest you contact Tableau support.
Hope this helps.
Thank you for replying.
Yes, they have values and all of my data has last day of the month linked to their values.
I read the discussion link that you gave me. From what I read, it seems that Tableau slider moves by days instead of months. However, since my data is on the last day of the month, I can't see that being the problem? When the slider selects any days in February, it still should include my data because my data is only located on the last day of the month.
Though you've got the data at the last day of each month,
they get truncated to the first day of the month
when applying a Continuous (Green Pill) Months range filter.
The actual calculation (internally) when making the filter is:
So anything on the left side of the filter
other than the first day of the month
would result in this month values to get filtered out.
There is a (less) known workaround --
using a daily calendar table as a Secondary datasource
and blending it with the Primary on the MY level only.
Please find the attached as an example.
Please check the Relations between the datasources.