This article lists all major known bugs and issues in Travian: Legends and Shadow Empires.
FIXED Sitters specific rights removed
When you remove one sitter, the other sitter's specific rights are removed as well. They can still use the sitting itself, but not any of the specific rights like the right to use Gold. The same happens if you remove yourself from sitting another account - your sitters lose the specific rights you had.
Workaround: if you remove a sitter or remove yourself from sitting, double check your sitters rights and set them to what you want them to be.
Update: the issue was fixed.