vm3. Product neighbours (next-prev). Incorrect work

[Piombo]

Hello!

vm 3.0.16
J 3.5.1

I have 5 products in category.

Open "product details 1":

- if I go to the right (next button) - I turn on the "product 2 - product 1" there and back
- if I go to the left (prev button) - I turn on the "product 5 - product 4" there and back   

so, I do not see the "product 3"  link

When I used vm2 I could see every "product" in the category by using next\prev

Plz help! Thanks!