git branch in Bash subshell "$(git branch -a)" including ls output as part of return?

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Hello Folks,

I am Running OSX 10.10.5 Yosemite along with git 2.6.3 installed via
homebrew package manager.

I recently stumbled across the following bug in some scripting I was
doing. "git branch -a --list" and "git branch -a" seem to include the
output of an "ls" command if executed as part of a subshell in a bash
script. I can't speculate to the reason.

Script goal: Delete all branches aside from master in the repository
Example outputs from several commands  repo:

ls output:

ajonespro:Deploy_Script ajones$ ls -l
total 0
drwxr-xr-x  11 ajones  wheel  374 Dec  7 10:50 AppDeploy
drwxr-xr-x  11 ajones  wheel  374 Dec  7 11:15 WebDeploy


git branch -a output:

ajonespro:Deploy_Script ajones$ git branch -a

* DWH_concurrent_api
  Email_No_Error_If_No_Old_Version
  IT/configs_in_app_support
  PHP_Build_Repo
  master
  remotes/origin/DWH_concurrent_api
  remotes/origin/Email_No_Error_If_No_Old_Version
  remotes/origin/IT/configs_in_app_support
  remotes/origin/PHP_Build_Repo
  remotes/origin/master

echo $(git branch -a) output:

ajonespro:Deploy_Script ajones$ echo $(git branch -a)
AppDeploy WebDeploy DWH_concurrent_api
Email_No_Error_If_No_Old_Version IT/configs_in_app_support
PHP_Build_Repo master remotes/origin/DWH_concurrent_api
remotes/origin/Email_No_Error_If_No_Old_Version
remotes/origin/IT/configs_in_app_support remotes/origin/PHP_Build_Repo
remotes/origin/master

While it might be hard to see from that output, The first two
"branches" in the subshell's output are actually the directories
contained within the repo. If I place a file at the root it includes
that in the branch list as well. Since my test file "test.txt" (not
shown in example) and "WebDeploy" are sorted before all the branches,
I suspect some output buffer is being accidentally being written to.

Has any experienced this before, and can anyone reproduce it on a
different configuration? I wouldn't be surprised if it was some weird
bug with Apple's included terminal, but since I've only observed it
with git branch, I thought I'd try contact git maintainers first.
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