Pi SDL2 some letters dont work

[HerbFargus]

Sometimes letters dont work in different parts of the menus:

Room Speech Box: ipasglcn

Server Name: rtgx

All the letters seem to work in the search box of the multiplayer lobby menu

There doesn't seem to be a whole lot of consistency of what doesnt work and when.

[mmatyas]

On Odroid XU3, the L and 7 don't work when adding server IP.

[HerbFargus]

On SDL1:
Player Name: sD
Server Name: PX
Room name: no problems