Not all districts are visible on the District Stockout Rates over Time graph in the Stockouts report

I noticed that not all districts for which there are submitted regular requisitions containing products with SOH = 0 are visible on the District Stockout Rates over Time graph in the Stockouts report. On the graph, only Balaka is visible, even though also Zomba, Lilongwe and Neno should. Please look at the attached screenshots.

Reproduction steps:

1. Log into the application as administrator.

2. Go to Reports > View Reports.

3. Go to the Stockouts report.

4. The District Stockout Rates over Time graph doesn't contain all districts that are visible in the "Reporting Rate and TImeliness" section.

Expected results:

• The District Stockout Rates over Time graph should contain all districts that are visible in the "Reporting Rate and TImeliness" section (i.e. all districts for which there are submitted regular requisitions containing products with SOH = 0).