xhtml errors in subsilver2 when using the bbcodes code and quote in signatures

When i use the code or quote bbcode in the signatures and browse viewtopic each signature containing these bbcodes gives out 2 xhtml errors every time a signature is shown.

This behavior is not present in prosilver viewtopic or in subsilver2 memberlist.php?mode=viewprofile.

Errors checked remotely with http://validator.w3.org/check and locally with firefox browser plugin.