Update to 2.0.22b caused changes in product Tax and discount settings, how come?

[amymattian]

Hi,

When updating to 2.0.22b we experienced the following problems:

1) Some products got a new price tax definition "APPLY DEFAULT RULES" (before these products had 14% tax definition)
2) Some products got the discount definition "APPLY GENERIC RULES" (before the products had discount via rules function)

How is it possible that an update can cause such behavior? This should not happen! Any ideas what can cause this?

Greetings,
Anne