Hummingbird broke the css on a clients site

I'm hosting and setting up a site for my client using the "Candidate" theme by Themeblossom. The site was set up and styled just how my client wanted. Nothing has been done to the site since the install and setup.

Last week I became a WPMUDEV customer again and wanted to speed up the sites I'm hosting so I installed, network activated and setup Hummingbird. The Impreza theme was unfazed. The Candidate theme suffered. and all the styling is broken.

I reset Hummingbird to original settings and network de-activated it. The site has still not gone back to normal even after clearing browser cache and testing on other browsers.

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