Subtitle layout glitch
Without a subtitle, there is a layout glitch when I compile the template ( 9a50b1ca ) with xelatex on my machine.
I was able to fix it for my setup with the following patch: https://gitlab.rhrk.uni-kl.de/roob/presentation-eit-latex/-/commit/c158813f297f47551ef9110ba21e4a7766f301da
With subtitle, before and after look equal to me.