Autohome only goes up z axis after adding dual z axis

After adding the official Creality dual z axis kit my Ender 3 v2 won’t properly complete autohome. X and Y axes move correctly, and the z axis moves up as it always did, but instead of moving back down on the z axis it goes up more and stays up. Selecting autohome again just keeps moving it up. I never had this problem for over a year until after I added the second z axis. I followed the instructions, but I’d like to know what specifically to look for instead of taking it all apart only to start over. Thanks for your time!