I have noticed a few strange behaviors with the number of free packs during the past couple of weeks.
The most recent: about 10 PM EST yesterday, I had 16 free packs. I used 4. This morning (8 hours later) I had 12 packs.
A week ago, I had 16 packs and opened 1 pack. Since it was my first open after ‘midnight’ I received 6 free packs (I am Pro). Rather than 21 free packs, I had about 12. As I opened packs, the count of free packs would sometimes increase by 1 or decrease by 1. Ultimately, I got to use all of what should have been my 22 packs.