Mclerren,
This happened to me, and I was told that this only shows products that have positive inventory. I do not use inventory, so all of my products had 0 for inventory. Once I ran a SQL statement to update all of my inventory to 500, then they all appeared in the Facebook catalog. This may be your issue as well.
Check some of the previous posts and someone listed a SQL statement you can run to update all of your inventory. Hope this helps.
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