Romas,
great to hear that you are using
https://www.map.army and thank you for your error report.
> Printing maps with MGRS 1:25000. The problem is I need MGRS so I could use military protractor but often it prints out without grid lines numbering.
We could reproduce and fix this issue. The latest version of the web application does include the line numbering in the coordinate grids in exports/prints:

> Also scale line length does not change when you zoom in or zoom out on the web browser.
This issue could not be reproduced on our side. Can you please give us an example where you face incorrect length of scale?
Kind regards
the map.army team