I have been using Specials tab for a while and it seemed OK.
Now it just shows some random products for which there have never been any specials.

I attach 2 screenshots:
1. main page when on the right column I have Specials tab
2. Featured products where I put “Specials” filter on.

You can cee that on main page there are products shown on the specials tab.
these products are not specials (which can be seen on screenshot with Featured products).
Also I looked in DB oc_product_special and that corresponds to Featured product selection with “Special” filter on.

why Specials tab show some random product I could not find out.

Do you have any ideas?

the site is http://mrchan.ru/uhta