More then likely the nut that holds that wiper arm to the linkage has come loose. I would suggest removing it and operate the wiper with that arm off so that they go to the proper park position and then reinstall the wiper arm.
I attached the process for how to replace them and adjust the arms below if you need to review that.
Let us know if you have questions or how you make out. Thanks
Images (Click to enlarge)
Saturday, February 13th, 2021 AT 8:08 AM