Pretax price is showing instead of Tax Inclusive price

[Big Vision Ltd]

My tax setup, cutomer goup tax preferences and product retail price with tax are setup correctly.
However when I clear the cache on my PC, the homepage, category pages and product pages all show the PRE-TAX amount. When I refresh the page, I see the correct RETAIL PRICE with TAX whcoih i what I want.

 

This is new bug for me. Prestashop 1.6.1.4

Can anyone help.

http://www.bakersshoes.co.nz

 

Customers are complaining that prices keep changing, and I am at a loss. I have spent many hours going over my settings, but nothing has changed in the setup for many years. The website always used to show the RETAIL PRICE with TAX, now PRE-TAX amounts keep showing.

 

HELP!