From a customer support case:
I've got an issue with TOC inside a page in a directory. On page  I have placed a <<toc>> element and I expected it to list all headings in the current page. However instead of:https://bitbucket.org/USER/REPO/wiki/Examples/TEST#!valid-examples
I get links simmilar to:https://bitbucket.org/USER/REPO/wiki/Examples/Examples/TEST#!valid-examples
This means there is an extra "Examples" part.