Thread designation in technical drawings it is not always displayed correctly. This is the setting in the view properties Thread designation display.
Generally, a change to High quality results in the correct display of the marking. Napisałem “generalnie”, because it happened several times in my life, że zadziałało dokładnie odwrotnie – czyli lepiej się gwint wyświetlał z opcją Draft quality.
Also read:
Why are the thread designations not visible in the assembly drawings?