Thanks for reaching out to report this, @Sigrid_Ramberger . It sounds like this could be buggy behavior. That said, I will be moving this to the Bugs section of the Community.
In order for us to investigate this as a bug for you, can you please submit a bug report by clicking the ? in the bottom right hand corner of your Coda doc or dashboard? Please be sure to share your doc with us so our team can attempt to reproduce the issue.