How can I prevent this?

When the A1 starts a project and starts the calibration process, the Z axis test will sometimes cause the feed tubes to get stuck behind the top support bar. I can move the AMS any further or the tubes will pull too tight. Help please.

When the A1 starts a project and starts the calibration process, the Z axis test will sometimes cause the feed tubes to get stuck behind the top support bar. I can move the AMS any further or the tubes will pull too tight. Help please.