WP Admin different on one computer – not posting blog posts

Hello! Firstly I am not very computer savvy but am in desperate need of help. I’ve had my WP site for YEARS.

On 4-13 I logged into my dashboard and noticed the version needed to be updated. I updated and then posted a blog post (I’m a photographer) – I emailed my clients their link (which shows just fine on my mac) and they said they couldn’t see it. I posted another two posts for clients and both said they couldn’t see them – they get error 404. I can view them all on my computer.

So I then checked it out on my phone and my husband’s computer and low and behold the posts aren’t there. Not only that, but when I logged into my dashboard on those devices it didn’t even show that WP was updated! It was like a mirrored dashboard (I checked my URL multiple times) I’ve tried deactivating all plugins (and made sure all are updated).

I have tried logging in via Safari, Firefox and Chrome from my Mac and all are showing the updated blogs – only from my Mac. I am totally stumped here as I can’t post anything new and get it to show from my work computer. Ideas???

My site: http://www.mariahmilan.com/blog

Last post showing before the issue started: http://mariahmilan.com/blog/2016/03/maui-sunset-photographer/

Three posts that seem to not exist anywhere except on my computer:
http://mariahmilan.com/blog/2016/04/maui-family-photos/
http://mariahmilan.com/blog/2016/04/maui-vacation-portraits-j-fam/
http://mariahmilan.com/blog/2016/04/maui-family-portraits-f-family/

Please help!