This might be out of scope for the org list, but the excellent emojify-mode (https://github.com/iqbalansari/emacs-emojify) breaks the alignment of org tags when emojies are included in the headings.
So:
```
** TODO write something short :writing:
```
but
```
** TODO :waving_black_flag: write something short :writing:
```
Emacs : GNU Emacs 26.1 (build 1, x86_64-apple-darwin17.5.0, NS appkit-1561.40 Version 10.13.4 (Build 17E199))
of 2018-06-13
Package: Org mode version 9.1.9 (release_9.1.9-65-g5e4542 @ /usr/local/Cellar/emacs/26.1_1/share/emacs/26.1/lisp/org/)
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[O] Bug: tags-emoji-alignment [9.1.9 (release_9.1.9-65-g5e4542 @ /usr/local/Cellar/emacs/26.1_1/share/emacs/26.1/lisp/org/)],
Will Pierce<=