This seems to be a problem caused by your system's Font Size setting.
Right-click on your desktop, and go to "Screen Resolution -> Make text and other items larger or smaller". This will open Display settings, and at the top it should say "Change the size of all items". Below there is a slider with 3 settings. Soldat is designed to work with the "Smaller" setting which is default on most desktops, but if you're like me and use a big TV screen instead of a monitor - that setting may default to Medium and cause Soldat to not render properly
To fix this, set Font Size to "Smaller" (don't close the settings window yet) and start up Soldat. Now it should appear normal. With Soldat still running, go back to Font Size settings and change it back to whatever you want. Now you can close display settings, and Soldat should run fine from now on. It worked for me at least.