This should be fixed now.
You may need to turn on the strip extension in your .hgrc.
To prevent this from happening in the future, I'd strongly urge contributors to *not* have yt_analysis/yt as the default path in the hgrc file for the repo (located at $YT_REPO/.hg/hgrc). Instead, point your default path at your fork and add an alias for the main yt repo. Here is what my repo's hgrc looks like:
[paths]
default = bb://ngoldbaum/yt
mainyt = bb://yt_analysis/yt
To pull from yt_analysis/yt, I just do "hg pull mainyt". I *never* do "hg push mainyt".
Please let us know if you encounter any issues related to this. Sorry it took so long to fix, but apparently we triggered a bug in bitbucket's PR handling code that one of the bitbucket engineers had to work around to manually strip the changes.
-Nathan