Sometimes when I use the context menu option 'Extract here' (which calls 'engrampa --extract-here %F'), the folder that is created after the extraction has a '(2)' in the end:
http://www.mediafire.com/convkey/f98b/b8zji5o9bmozcwszg.jpg

I don't think this is a Engrampa issue because this folder doesn't actually exist -- I can't access it. However, if I refresh the parent folder or simply close this Thunar instance and open a new one, then I see the actual folder (with no '(2)'):
http://www.mediafire.com/convkey/9cc4/qdget8ekjc13e81zg.jpg

This is a random bug, so I don't know how to replicate it with 100% consistency. It happens on basically all Thunar versions, including 1.8.14