Q: When you try to create several VPSs, only first VPS have correct owner
A: sorry but typically the module was designed for one person and one vps therefore no matter how much we try to make it multi user capable that is impossible currently with the current opennebula xmlrpc api and no we cannot fix something we don't have control over sorry.
this may be possible in our blesta version though it is not possible at all in whmcs due to the complexity required to do so in whmcs vs easier done in blesta.