GitHub and Git tabs always open at launch, and no longer opens in separate pane

Prerequisites

• Put an X between the brackets on this line if you have done all of the following:
  • Reproduced the problem in Safe Mode: https://flight-manual.atom.io/hacking-atom/sections/debugging/#using-safe-mode
  • Followed all applicable steps in the debugging guide: https://flight-manual.atom.io/hacking-atom/sections/debugging/
  • Checked the FAQs on the message board for common solutions: https://discuss.atom.io/c/faq
  • Checked that your issue isn't already filed: https://github.com/issues?utf8=✓&q=is%3Aissue+user%3Aatom
  • Checked that there is not already an Atom package that provides the described functionality: https://atom.io/packages

Description

GitHub and Git tabs not behaving as expected.

Steps to Reproduce

From what I remember:

1. Summon the GitHub Tab and Git Tab via Ctrl+Shift+9
2. Drag the GitHub Tab into it's own pane.

After this issue appears once; the issue appears everytime at launch. Furthermore, doing a full reinstall of Atom (eg following these steps: https://flight-manual.atom.io/faq/sections/how-do-i-uninstall-atom-on-macos/ and then installing again) does not fix the issue, and the abnormal behavior appears at launch.

Expected behavior:

Normally (how it's always been since I started using the feature):

• Git/GitHub Tabs should not open at launch.
• Ctrl+Shift+9 will toggle both GitHub/Git Tabs to appear/disappear together in a new pane.
• Clicking between staged/unstaged changes on the Git Tab should open difference tabs on a pane that is not the one occupied by the GitHub/Git Tabs.

Actual behavior:

Now:

• Git/GitHub Tabs do open at launch.
• Ctrl+Shift+9 only toggles the Git Tab and the Git Tab appears in the current pane.
• Clicking between staged/unstaged changes on the Git Tab opens difference tabs on the same pane occupied by Git Tab.
  • This is inconvenient because it means I have to switch back to the Git Tab after each time I click to see changes. It's much nicer to keep the Git Tab in it's own pane and have changes appear in a pane that is not the one occupied by the Git Tab.

Reproduces how often:

Every time.

After this issue appears once; the issue appears everytime at launch. Furthermore, doing a full reinstall of Atom (eg following these steps: https://flight-manual.atom.io/faq/sections/how-do-i-uninstall-atom-on-macos/ and then installing again) does not fix the issue, and the abnormal behavior appears at launch.

Versions

Electron: 2.0.18
Chrome  : 61.0.3163.100
Node    : 8.9.3

macOS Mojave version 10.14.5

Additional Information

Thanks! :)