CSS – can't figure this one out!

Hi,

My main website is here and the WP blog is here.]

I also have a subdomain working on the same theme but with different colouring in the stylesheet (see here) and this is running the Events Calendar plugin.

Both sites are running on a WP network.

I have set up two child themes of the Bootstrap Canvas WP theme to make the WP bits look like the rest of the existing site (one for each site).

My problem is this, if you look carefully you will notice that the CSS is fine in the header and the navbar, but then seems to be ‘broken’ below that point (for the main body and the footer), as the fonts, header sizes, header colours etc are all wrong! This error is the same on both sites.

What’s weirder is that it used to work fine! The only thing I did was play around with changing the styling of the events calendar. I have since removed all customisations but the error is still there.

If anyone could offer any insights I’d be very grateful – I’m completely stumped!!

Thanks