We are currently developing on 5..8.0.3 its all been going very well until suddenly today (in the last 12 hours the urls for the home page have changed from / to /-1/ and most of the sub folders also have /-1 at the start of the url, so /faq becomes /-1/faq,etc. This can be seen in the front end and in the dashboard sitemap, I have confirmed that this isnt a proxy or environment issue, I am seeing the same paths in the pagepaths table.
This site isnt live yet, its accessible only by knowing the ip address of the site and having your public ip added to the allowed list. so its very doubtful it a hack, but the questions are
1. How did this happen
2. Can the database be cleaned to avoid having to rebuild the site

Has anyone experienced this, what was the root cause?

Thanks
Martyn