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Is this a screenshot from one of your members?
If not and you're testing a "Standard User" on an account that of which is set to Operator, the Operator flag on the account will override the Standard User settings.
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Aha! That may be it. It is an Operator that has switched profiles to a "Standard" test user. Does that happen only for the Wiki settings?
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Yep, there's several sections of the site that allow the Operator status to override the permissions. Even the page visibility is overridden by being logged into a Operator account.
As @Wise suggested, it's best to have two accounts entirely for testing your sites permissions. Have your test account remain as a non-operator (this is default) and create profiles with differing roles on that non-operator account. This makes testing all the different permissions a breeze.
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