Hi,
Thank you very much for your kind words, I really appreciate them.
I think you have just discovered a new issue, that we never seen before. Your configuration seems perfectly fine, the {get_values} also seem to work okay – it prints out all the possible values as stored. The solution will be to simply enter the values manually, but that is not the problem here.
I noticed, that the field name contains bracket symbols, and I got suspcicios, that it might cause a problem with how the values are passed along from the search form to the back-end. Brackets are also used in form elements, so I guess that must be the issue there, as I cannot see it passed along with the request.
Can you add temporary FTP details to your ticket? I would like to degug through the code, to see how those values are passed, and make a correction where neccessary. I will also investigate this locally until then.
I already made a debug change to one of the files via the plugin editor, but I would rather prefer using (s)FTP if possible, as it is much safer and faster.
Thank you!