Column Chart Randomly Skipping a Month

I'd like to show a column chart, with dates across the x-axis, and values being the running balance of a table. The running balance should show the cumulative total of values up to the end of the month shown in the x-axis. 

The format/shape of the image below is exactly what I want, but notice that while correctly showing 12 months, it is skipping Feb-22. 

Output - looks per expectations, but skips Feb-22

Below some images for the actual structure of a sample I've made. Here is a link to the sample file

IndexMonth does actually change from Jan-22, to Feb-22, to Mar-22

Structure of Date Table + DAX for IndexMonth.

Structure of Test Data table

Note that the issue persists even if I filter the visual By value RunningIndexMonth from the Test Data table, OR By value UndexMonth from the Date Table.

I must be doing something wrong with the linking/Index Month, but because everything seems to work other than specifically missing Feb-22 (and a reproducable issue because I made this sample file specifically to mirror my real file), I'm at a loss...