Posts Don't show unless i Press Ctrl+F5

[sitesafe]

Take a look http://sitesafetymanager.co.uk/forum/

Any ideas Running SMF 2.0.12 & Manas Theme (have reverted back to other themes, same problem on all)

I've made a test user

Username = test
PW = 11111111

Try typing in a post and you'll see what i mean 

I just have these mods installed

1.   Say Thanks   1.3.6     
2.   RSS Feed Poster   4.2.1
3.   AvatarSelect   1.2.1     
4.   Yet Another YouTube BBCode Tag   3.11     
5.   Blue Smiley   1.0 
6.   Adshomepage   1.0 
7.   Remove "Last edit" mod   0.2.5     
8.   Tidy Child Boards   2.0     
9.   SMF 2.0.12 Update

Was told on SMF forums it was a Varnish Cache issue and to disable it but this morning its still the same 

I'm happy to pay for a fix, Its a new site, so if i need to reinstall and start again i want to make sure its not the same problem

Thanks in advance guys

[sitesafe]

OK Managed to get in touch with the Host company i use and they have disabled the Varnish Cache 

so all is working as it should!

[SMFHacks]

Thanks for update