U8glib funny problem
Your void_Menu_draw_test_man() function checks menu_redraw_required

Does your other part of the program update that variable? Do you call void_Menu_draw_test_man() from the loop() function?

It may help if you show the complete code, rather than small segments, since there are variables, such as menu_redraw_required, which are not changed anywhere in what is visible.

Note also that u8glib is no longer updated in favor of u8g2