Signals & Track [solved] Signals That Lose Their "confirmation"

Whenever I want to make an update in the timetable, an error occurs because two signals on the route get red instead of yellow on the route map. Then I have to fill track sections and everything is fine. But when I restart the editor, the signals are red again. Any solution for that?

 

What route are we talking about?

 

Sorry, I already got a solution: I deleted the old signals and placed new ones. Now it works, but thanks for replying!

 

Don't understand well: is this for your route on a default one?

 

For my route, the Almtalbahn

 

Ok, so it's a problem that can be solved only if it's possible modify the signal...
Thanks!