FaceFusion was made only for a single person usage, and being on a public Space there could be cross-content issues between other users' output, as explained in https://github.com/Nick088Official/FaceFusion-Online-Ports/issues/28 too.
This might be caused by the multiple people using it overtime and the way that the UI is developed in FaceFusion (which are multiple files for each component, basically in a queue). For this reason, I paused the Space, it will be available only for Private Duplication, which will also let you use it witout being in Queue.

How do I duplicate it privately?

1. On my Space, click the 3 dots at the top right and then "Duplicate this Space".
2. Set the visibility to PRIVATE.
3. Click "Duplicate Space" and it will built it in your own Space.
4. Enjoy your FaceFusion Experience!