alt gr not applied

i have an arch and an windows machine. im using on both the currently latest build from commit https://github.com/feschber/lan-mouse/commit/0ef8edb7b269974b918fd0c86ec4b785f36f0e8d. When windows is the host the "alt gr" key isnt passed to arch. Instead only the keys like they would be without it. With arch as a host it works