If you have dropdowns display labels that contain quotes or apostrophes, when you edit the dropdown and you add another element or just edit the display label of any element the resulting dropdown will have all the display labels truncated at the first quote (or apostrophe) found.
Note that the truncation takes place in all display labels except the new ones or the one being edited.
I noticed a second bug: only one lable can be edited. Then either you save and exit the dropdown editor or you are stuck in the inline edit mode of the label.