This is not a problem you caused. Posting to the main Facebook group would have been fine.
As mentioned on the main Facebook group, the server Pets 'n' Friends (and the forum itself) is hosted on is elderly, as servers go. It should not repeat at this time, but I expect rare reoccurences until the server is upgraded.
As hinted at in the messages, there was a technical problem preventing saving some user settings (e.g., the toolbar list) to the main hard drive. The database copy of those settings was unaffected, so everything should have continued to work.