Arrow/Line behaves very strange

Hello all,

I use the line tool a lot, combined with the added function to add a arrowhead its one of my ideal tools.

But now since a few days its no longer a line wich i can decide how it behaves, but i insert all my parameters, click to draw a line, and it get's huge in size, it looks absolutely ridiculous.

Then the parameters are all of a sudden all over the place and when i finally turn them down again yhe whole interactiveness of the line/ arrow is long gone.

Ignore the language, but these are the parameters.

Does anyone know the cause of this? It was never this strange before.

-Nick