I see. I did come across that function, but I couldn't figure out how to get the field data from the custom post. I found this on a help forum and tried to tie it in with rwmb_meta() and adding the table name argument.
https://wordpress.stackexchange.com/questions/247520/polylang-not-translating-metabox-fields
For now, I think I'll go back to just using the wp_postmeta table and worry about this another time as I do need to get the updates live pretty soon.
Thanks for confirming for me though! I thought I was going crazy.
