Windshield Wiper issue

[depchief]

Driving north on Tuesday 3/24/15 we had many areas of drizzle. Using the single swipe mode I noticed that the drivers side wiper blade was going further left the more I used it. It got to the point that that it was going off the glass and hitting the metal shield. The passenger side remained operating in the normal condition.
We encountered a downpour at one point and using the wipers created more issues. The left side hung up on the metal shied and I heard a pop.The blade and arm stayed hung up on the shield and the right side returned to the parked position.
Checking out the wiper motor and arms I found the connecting rod for the left side had popped off the arm connector. Putting it back in place and running the wipers created the same condition.Removing the blade from the knurl fitting and repositioning the arm closer to the center did not correct the issue.
Can anyone offer hints that I can do to correct the position of the blade. The connecting rod is a presized piece and is not adjustable