PG Snapshots - URL mapping removing other href URLs

I’m delighted that you’ve created Snapshots. I’ve been experimenting with it and find that if I do a simple URL mapping, it replaces the targeted URL but then removes all other URLs from other href’s.

For example:
if URL contains: style.css
Replace the URL with: /Volumes/Media 2TB/Local Sites/newci/app/public/wp-content/themes/hybrid-ci/style.css

That replace works without a problem, however going down the page there are only hrefs where there should be href = "[a URL]"