John first of all: Thank you very much for the quick support, you helped me understand the factors of the issue.
I hope Elliot will read this thread & descide to enable selection of the same value multiple times. It can dramatically improve data editing, proccessing & loading time efficiency in some cases.
P.S:
I’ve experimented with “hard replacing” the .js files of select2 in ACF with version 4 & it allows the multiple selection right out the box! But I didn’t risk saving because compatability must be made by ACF’s developer.
