hi!
I did have the same probleme concerning the pan on my IS 250 and 19-15 wash.
in the Capture 2021 Reference Manual, you can find out how to recalibrate pan and tilt (appendix 18.2)
I mean you have to follow the 3 questions and then send un e-mail at capture library so they can change the pan and /or tilt parameters. they will let you now when the fixture library will be updated (it takes 1 or 2 days).
hope it's gonna be helpfull for you.
Mika