Sorting by popular products acts weird

[Meton]

Hi All,

When i sort my page by popularity the following happens. If you go to the next page and then go back products will get a different sorting. Some of the products even end up on a different page. Does anyone know whats happening?

Kind regards,

Meton

I am using:
VirtueMart 3.0.18
Joomla 3.6.5

[Studio 42]

sort my page by popularity

[jenkinhill]

Template?