When there are both multiple as well as single-item drop buttons on the same page/table, there's inconsistency on their width and text alignment:

backdrop-drop_buttons-aligned_right_not_equal_width

That's because the multiple-item drop buttons need extra width in order to accommodate the drop arrow on their right side.

Here's how it would look with width: 113px and text-align: left applied to the single-item drop button:

backdrop-drop_buttons-aligned_left_equal_width

GitHub Link: 
https://github.com/backdrop/backdrop-issues/issues/1090
GitHub Issue #: 
1090