Alot of people forget to tell the wipers to complete 2 cycles before refitting the arms,
As when you tug and pull - they move slightly out and before you know it - you have the above
However
The wipers may need ""park"" resetting, and is the bushs or joints are worn (as stated above)
The wiper linkages may be at park at the motor, but the sloppy bushs means its not at park at the wipers
Ziggy