In the ‘Piklist Demos’ > ‘Demo Types’ interface, one can see alignment problems for two kinds of fields: “add_more” and “date/time” because of “float: left” styles in the wild without any ‘clear’ after them.

Regarding “add_more”, removing the “float: left” style from “.piklist-field-addmore-wrapper” works, but it then modifies the alignment of CPT fields too. Those are fine with the float style because they are within a ‘piklist-field-container’.
That float property should be overridden to “none” in the context of taxonomy fields UI.

Date/time fields seem to have their style inlined in the html.

This problem can be reproduced with custom terms fields of one of those two types.