Hello,
I also called support…. and did the manipulation with support.
After modifying my list I saw my channels unchecked again while the support saw them checked.
So I was told that my browser had to be cleaned… anyway…
With this experience I tried to do the following and it worked for me.
I created my personal list and made changes then saved.
Once registered I called the swisscom list and called back my personal list. Better, a lot better.
Made changes, saved, called the swisscom list and called up my personal list.
Do not save twice at the risk of losing your changes.
Yes, I know, it’s rather long but as far as I’m concerned I achieved my goals.
Good luck.