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The system module version is not directly related to the XOOPS version.
XOOPS modules can only have xx.yy versions, not xx.yy.zz like XOOPS itself. Therefore, when something changed in the system module to knock up the version, it does not have to be related to the XOOPS version - or rather, XOOPS can come in a new version without any changes in the system module (and thus no reason to increase the system module version).
To find your XOOPS version, look in /include/version.php
"When you can flatten entire cities at a whim, a tendency towards quiet reflection and seeing-things-from-the-other-fellow's-point-of-view is seldom necessary."
Cusix Software