Word press update bugs in Sydney

My site is www.mermaidstreasure.net.

My “PC” version still looks and functions correctly, but my mobile version was corrupted by the update, “Your site has updated to WordPress 4.3.2” that Wordpress instituted on Jan 6…It has corrupted my site so it is virtually unusable. Front page completely changed, no photo, enter button moved to far left etc.

My contact at Domain suggested I contact you for some help.
My theme is Sydney. I know I’m in Alizee but my first time using and I couldn’t figure out where else to post.
Thank you in advance for your help.