why is menu title not render properly on FR935?

i created this app to keep padel scores https://github.com/pedrorijo91/garmin-padel/

a user with Forerunner 935 is complaining the app does not work properly. According with him, these are the initial screens he gets:

initial screen (ok)

second screen (initial menu to select some options - where we see 'english' it should be 'Sets')

after selecting any option he gets this error:

I have no clue why screen 2 is not displaying menu properly. i suspect whatever the reason is leading to app to crash.

in the simulator everything seems fine:

1. any clue on what may be the issue? some API compatibility?

2. what's the best way to get more debug info for this and future cases?