Problem with price sorting on sales page

[paplo22]

Hi,

When I try sort by price for example low to heigth.

First page:

The first product has a price of (59.00 - old price) 29.00* (*sale price),

the last product has  a price of (59.00 - old price) 39.00* (*sale price), and it is correct,

 

but when i go to page two then :

the first has a price of (59.00 - old price) 29.00* (*sale price), and last has a price of (59.00 - old price) 45.00* (*sale price)

 

on on the third page :

the first has a price of (69.00 - old price) 29.00* (*sale price), and last has a price of (69.00 - old price) 49.00* (*sale price)

 

on the fourth page :

he first has a price of (69.00 - old price) 25.00* (*sale price), and last has a price of (69.00 - old price) 49.00* (*sale price)

 

and so on and so forth...

Hwo can i fix this? please give me some hints where to fint the solution

(if you wanna check website: https://ottanta.pl/promocje?order=product.price.asc)

 

PS: v1.7.6.5 

 

Edited June 21, 2021 by paplo22 (see edit history)