A strange program about switch sound font

Recently , My team produced a batch of Proffied V2.2 .
I found a strange program ,when blade up , pressed the key and switched the font forward .But when blade down ,switched the font back . I never found this exception.
Thank you !

What version of ProffieOS are you using?
What does your config file look like?

Thank you .
The engineer found that there was two versions of the OS . One had the program of blade up and blade down (switched the font forward or back).