Chart infographic not showing proper count

[JackCibor]

Web AppBuilder Dev Edition, v 2.13, Dashboard theme app.

I have two info graphics in my app. One that shows the count of all rows in the current feature set (the data source is an 'Extra Data Source' showing Stats for a layer. . And another that is supposed to show the count per month of the same Extra Data Source' in a bar chart. However if you look at the graphic below, the counter shows 120  (and the attribute table widget has 120 rows), The Chart Infographic widget that is set to group data by month (Minimum period = Month) is only showing a count of 105. Any explainations for how this happens and how to correct the issue would be appreciated as would any tips on how to troubleshoot.