Application keylogger issue with Datasafe

It can't mask keystrokes captured by a keylogger on the host machine/client if that's what you're asking about. It sounds like it's working as expected (encrypting in browser/L7, encryption in transit, and data is masked in logs).

Features:

'''

•  protects sensitive information from interception by encrypting data while it’s still in the browser.
•  DataSafe encrypts data at the application layer to protect against malware and keyloggers. 
•  This renders leaked credentials or data useless.

'''

-https://support.f5.com/csp/article/K11023343