If you saw the Release Notes for Pages, It states you must be running WP 4.4. Also something on your site is causing Google Maps API to be called. (see attached)
I went to your main site and the Find church now Button worked, I do not know what the screenshots you included in first post is intended to show , when I tried to access that http://crossroadschurchsydney….URL I could not so is that a permalink issue perhaps?
A lot has changed with the Pages and WP codex on how you could set up pages (which is a Post )
So could you provide more detail about your page template.
Nothing in SLP updates effected CSS if they were saved correctly as far as I know.