Hummingbird site layout issue? How to clear cache?

Hi, I installed hummingbird to attempt to speed up my website, and it seems to have done so quite well but now one page is completely messed up.

I am trying to figure out how to fix this, I was originally going through all the minification settings and one-by-one disabling and enabling them, but our developer said I should just try to clear the hummingbird cache (I didn't even know caching was enabled yet tbh, I didn't enable it manually) but I don't know how to clear the cache for hummingbird? Could you please let me know how to do that. Thank you.

I have granted admin access if you need it to check anything. Just let me know if you need any further information from me.

The page that is not displaying correctly anymore is http://stevemills.theurbancollectivesitedev.com/cotswold-roofing/