Thanks, I reverted back to the original object and made sure I wasn't in a Teamshare file and edited the object again and only 7 of the 110 objects were jiggered this time. Rather easier to fix than having to replace all 110
AC versions 3.41 to 25 (UKI Full 5005).
Using AC25 5005 UKI FULL
Mac OSX 10.15.7 (19G2021) Mac Pro-2013 32gbRam AMD FirePro D500 3072 MB graphics