Question Everyone becomes an administrator

A few months ago almost all the registered members of the site/forum suddenly changed to become administrators, and I can't find any way of turning them back to ordinary registered users. This is a site I set up and do occasional maintenance on when asked - but suspect that is was not updated and may have been hacked, or something corrupted. I have updated whatever I can, including Kunena to the latest version (although Joomla Extension Manager still shows the version as 3.0.3), and tried changing access levels back to default settings. However, nothing has made a difference and all but a few members still appear as adminstrators and can edit all posts.

I searched the forum, and it looks as though there is another thread on this topic, but unfortunately in German. I would really appreciate it if anyone can help with this.

Site report below...

Thanks

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Kunena menu details:

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Kunena default template details : Blue Eagle | author: Kunena Team | version: 3.0.5 | creationdate: 2014-03-09

Kunena version detailed: Kunena 3.0.5 | 2014-03-09 [ Invecchiato ]
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Kunena config settings:
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Kunena - AlphaUserPoints Disabled
Kunena - Community Builder Disabled
Kunena - Gravatar Disabled
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Kunena - Joomla Enabled: access=1 login=1
Kunena - Kunena Enabled: avatar=1 profile=1
Kunena - UddeIM Disabled

| Joomla! detailed language files installed:

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Joomla! languages installed:
de-DE	German (DE-CH-AT)
en-GB	English (United Kingdom)
fr-FR	Français (FR)
nl-NL	Dutch (NL)
ru-RU	Russian
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Third-party components: None

Third-party SEF components: None

Plugins: None

Modules: Kunena Latest 3.0.1

G'day,Templecloud, and welcome to Kunena.

I suggest that you look at the topic All users have Administrator privileges . In that topic a number of different scenarios are discussed that cover 99% of the reasons why this happens (sometimes ... in extremely rare circumstances ... when people change things on their websites). It is not normal for this to be a Kunena issue; this is more a Joomla site management issue.