Why can't my blueprint object move further than 175 units?

Hello, I got a problem:
I made a future sliding door with blueprints scripting. This is my script:

The door first rotates and then it moves out.
In the timeline I have a moving template:

Now here is my problem:
If the value of the moving is over ~175, it begins flackering. The higher the value ist, the more it moves rapidly, but it doesn’t go out further.

As you can see,the doors move away ~175 units and then they don’t expand anymore, but they are just bugging around.
What can I do?

How are “rotator” and “move” actually changing?