Syncing Metadata from ACF (Custom Fields)

I have downloaded and installed the plugin on two sites, site1.example.com and site2.example.com. ON site1.example.com, I set site2.example.com as the remote site, and on site2.example.com, I set site1.example.com as the remote site. The sync is working because I was able to update a user on site1 and have that user automatically created on site2. However, when I go to enter the metadata columns I want to sync in the outgoing settings on site1, I get two options for each custom field. One is the slug of the field as entered in ACF and the other is the slug with an underscore (“_”) in front of it. I have tried using both options, but when the user syncs from site1 to site2, the metadata is not showing in the “data” array in the logs and the custom fields in site2 are not updated with the correct values. The slugs for the custom fields are the same on both sites, but there are some custom fields on site1 that are not on site2 (but I did not put those custom fields in the outgoing metadata box in settings). Can you help me get this working?