Not knowing your experience with this, here’s some detail on repositioning the wiper arms.
It’s possible one or both wiper arms have spun on the spindle it attaches to. There’s a fair chance you can solve the problem by loosening, resetting, and retightening the arms.
Here’s a view of the pivot end of a wiper arm. Typically there’s a hinged plastic cover that can be raised to expose the nut.
First just try to move the wiper arms through their arc by hand (wipers turned off). Normally you shouldn’t be able to rotate the arm on its spindle. If you can rotate one (or both), remove the nut(s) and take the arm(s) off the spindle. If you can’t move either one, take them both off.
Note that the wiper arm is spring loaded at its hinge – lift the arm all the way up so it stands perpendicular to the windshield so you don’t have to fight the spring, and if necessary pry it (gently) off of the spindle. (Some arms don’t lift up that high and have to be pried against the spring pressure.)
Then turn the ignition on (no need to actually start the engine), turn the wipers on, and turn the wipers off. The wiper mechanism should stop at its park position, which will place the arms down along the bottom of the windshield. Now turn the ignition off. If you left one arm on and it doesn’t rest in that position, remove it.
Now, with the mechanism and spindles at their park position, reinstall the arm(s) you removed so that both arms are lying at their normal “off” position at the base of the windshield. Lay the arm(s) down flat and press onto the spindle(s) against the spring, then install the nuts. Tighten both nuts snugly (even on an arm that wasn’t taken off). Operate the wipers and see how they do. Some liquid on the windshield will help them move easily across the glass. If they work but aren’t in just the right park position, readjust (loosen the nut, reset the arm, tighten the nut).
Here’s hoping that’s all you need. If this doesn’t do it, then some other part of the mechanism will need repair.