I assume this is the same bug, but for me I have a custom taxonomy on my pages. When I select one/all the terms and save a new term is created based on the term_id. ie. I know have a bunch of terms like 87, 88, 89…
Save/load is turned on. Saving to $term_object or $term_id makes no difference.
Reverting to 4.1.8 fixed the problem for me.
http://downloads.wordpress.org/plugin/advanced-custom-fields.4.1.8.zip