Sort product in search result with special price

[JDStar]

Hi.

In search result is bug with special prices, example:

Product sorting price ascending

 

Now result is:

-product 1: price 0,55
-product 2: price 1,19 special price 0,99
-product 3: price 1,79 special price 0,95
-product 4: price 3,29

correct result should be:

-product 1: price 0,55
-product 3: price 1,79 special price 0,95
-product 2: price 1,19 special price 0,99
-product 4: price 3,29

How i can fixit this?

Prestashop 1.6.0.5