after you apply the changed policy, are you able to into Options\security\general settings and change the "number of password attempts" to 6 manually?
There are some policies that allow a setting to be a certain max, but the user has to change it to that max number if they want it. So if you set a more restrictive policy, it changes to that specified limit on the handheld, but doesn't change it back if you loosen up the policy. Its my best guess without going into my BES and reading all the policy info (I'm seem to have a case of the Mondays
)