SYMPTOM:
Negative values on a graph axis do not keep the number formatting when the graph is displayed in Strategy Mobile 9.3.1 on iPad.
The formatting is applied correctly to all positive values.
This issue does not occur in Strategy Web.
Graph with negative values displayed in Strategy Web - the currency is displayed correctly:

Same graph with negative values displayed in MicrosStrategy Mobile - the currency has disappeared:

CAUSE:
This is a known issue that occurs in 9.3.1. and has been logged with Technology.
ACTION:
This issue has been fixed in Mobile 9.4.1 iOS Update 2.
Please apply the update to take advantage of the fix.