Incorrect Product Star Rating on Google Snippet?

[DAus]

Google is showing all my products as having a 2 star rating even though some of my products have higher ratings. I tried fixing it by following this thread https://www.prestashop.com/forums/topic/324422-solved-average-product-rating-wrong/ 

namely: 

 

<meta itemprop="ratingValue" content = "2" />

to

<meta itemprop="ratingValue" content = "{$averageTotal}" />

 

However, it's been two weeks and it still shows the same 2 star rating through Google search. Does anyone know how long it takes to refresh Google ratings or am I doing something wrong? 

 

Also, how do I disable it (the rating) from Google search completely? 

 

 

[lochot]

Google use the itemprop values to show that, if you want to remove it from google, you just have to remove the meta tag