“Focus on Selected Building” is called everytime horizontal input is given (so arrow-keys or ‘A’ or ‘D’). So it’s called only when those input values are non-zero … Now that you mention it, that could be it!? Maybe I let go and it’s not called?
I’ll try to put the function-call in “Event Tick” instead, thank you! I’ll try it tomorrow, I’ll tell you if it worked out! 
Thank you so very much for your help already.