No, you DO need to worry about that.
You may have not uploaded all the files that you needed to. The version in the footer isn't directly written - instead, it is echoed as follows:
Version <?php echo PHPVMS_VERSION; ?>
So there are at least parts of your system that thinks it is still on 2.1.936.
How did you go about moving over to v2? It is important as there are differences in the DB itself which need to be addressed.
Regards,
Pete