Sled will not go to top of board same parts are cut different sizes

I’m getting “Unable to find valid machine position” after changing motor distance from 3613.15 to 3613.77. Happened immediately. This is surprising for such a small change.

I hade already homed the sled before changing the value. The motor distance was the only thing I had changed when the error came up.

I’m confused how this is a work around. Unfortunately I’ve already started the reset chain lengths. I pressed “automatic”, which never results in the same tooth going back to 12 o clock position for me. I didn’t have time to complete the process so, out of curiosity, I pressed the “move to center” button which moved the sled all the way off the bottom of the frame. I know that isn’t the correct process.

I don’t have access to the ini file tonight.