I’ve just read over your support thread and can only re-iterate what has already been said.
The issue you are experiencing is due to a limitation with the ‘load/save terms’ setting on the taxonomy field. This setting only works with the last field on the page, and does not accumulate all fields within the page.
I will look for a solution soon, and in the meantime, I suggest you disable the feature and consider writing some custom code to update the post’ terms based on all that have been selected
Welcome to the Advanced Custom Fields community forum.
Browse through ideas, snippets of code, questions and answers between fellow ACF users