Heart Rate not Syncing to Garmin Connect

I've just realised that my HR (both during activities and resting) hasn't synced with GC since yesterday afternoon, even though other stuff (steps, activities, sleep) has synced fine. Synced activities will show my HR as recorded in the FIT file, but all of the HR-related widgets are empty, and it's the same on GCM on my iPhone.

My f5 is showing my HR just fine, both my current one and my 4-hr history. I've tried a wired sync with Garmin Express in addition to the normal Bluetooth syncing through my phone, but still nothing.

Anyone else having a problem?