Prices randomly disappear or a rule affecting final price appears

[lorree63]

I set my prices with "Apply no rule".
Then for no apparent reason the prices will randomly disappear. I have some products that have 20-30 children and one or two of the child products will show up with no price.
Some products are singles and will randomly have no price.
Also, the prices will show with a 30%, 40%, etc. rule, at random when no discount was given by me.
Please help me understand what I need to do to fix this problem.
Thank you.

Joomla 2.5.9
Virtuemart 2.0.18a

[Maxim Pishnyak]

You could update your VM to more recent version.

Also pls post here backend screen shots of your parent and child (this one - with invisible price) products.

Do you have your web shop in real web environment?