It’s a limit that’s imposed by Glide. No more than 9 roles per user.
For an out of the box option, take a look at this post from @ThinhDinh. Very clever workaround for creating a dynamic Owner array, that auto-increases in size as required. But again, only possible with Google Sheets.
With Glide Tables, the only thing you could do is make sure you have enough owner columns predefined. If somebody could suggest a better way, I’d be all ears.