Fred’s is great advice, Bill. I’ve found a slide “popped” numerous times, though never askew like you describe. Simply cycling the “out” solenoid a bit and then the “in” solenoid, and squealing the pump a second or two after the slide seats back in, always clears the solenoid seals so they seat again.
With the unit out of alignment it may indeed be best to run it all the way out before retracting it, so the sides have a chance to even out. As Fred notes, the askew aspect may be indicative of a hydraulic leak between the solenoids and the rams, a broken or worn drive mechanism part, or something hanging up one side, so check those out even if cycling solenoids seems to resolve the popped slide issue.
Joel