In the FE Your account details, Shopper Information tab, Shopper Group selection box only shows two Shopper Group entries.
I fix the problem
administrator / components / com_virtuemart / helpers / shopfunctions. php
$attrs = 'multiple="multiple" data-placeholder="'.JText::_($select_attribute).'"';
Change
$attrs = 'multiple="multiple" data-placeholder="'.JText::_($select_attribute).'" size=""';
[attachment cleanup by admin]