Can you share your save game with us in which this is the case (either or both of you)? This will help with investigating further. We have a few instances under review already, but would find it beneficial to have as many examples as possible to ensure we catch as many scenarios behind this.
A guide on how to do so is available here: https://community.sigames.com/bugtracker/instructions-and-notes/how-to-upload-files-to-us-r98/