It may be that the multi-plug for the indicators has come loose and is moved when you alter the angle of the steering column.
Take off the instrument binacle (2 screws ) & disconnect the speedo cable & you will find that hidden somewhere in there there are two multi-plugs plugs connecting the indicators & wipers. If I remember rightly the plug on the left is the one you'll be looking for.
I can e-mail you the "how to" if you need.
It's not bizarre..it's Italian !!!
