the gui screen captures on the plan branches page under gatekeeper and branch updater seem to be confused:
https://confluence.atlassian.com/bamboo/using-plan-branches-289276872.html
The bubble charts are correct but the gui captures seem to be wrong.
Under branch updater, the bubble chart appears to checkout the feature, merge from the master and then push to the feature, however the screen cap shows the opposite.
Under gatekeeper, the bubble chart appears to checkout master, merge the feature, then push back to master, but the screen cap shows the opposite.
This topic is confusing enough as it is. Please at least get the documentation right.