Scheduled Posts & Custom Fields

I’m having the oddest time with scheduled posts… Every time a scheduled post is published, the custom fields are erased. The “Key” is still there but the “Value” is empty. The value is there when I initially save, when I initially set it to be published at a later date, and when I view the post before the scheduled time. However, as soon as it publishes the post (at the scheduled time), the values are gone. Any ideas? Thanks in advance for your help!