It’s possible that Facebook is still holding on to an earlier player you embedded. Enter the Bandcamp URL you’re sharing here to zap the stale files instantly:
Once you’ve done that (ignore what it says on the debug page), try sharing your link on Facebook again. If it doesn’t work the first time around, try using the specific track or album URL.
The Like count is controlled entirely by Facebook -- we’re just displaying the data they give us. We’ve seen Like counts drop in the past, and they’ve always recovered not long after. If your counts don’t, give Facebook customer support a shout.