Vault Progress from opening TLA packs is not incrementing correctly.

I crafted full playsets of all the Commons and Uncommons from TLA (The Last Airbender), and I have noticed from opening the past 30 TLA packs, that my Vault progress is always not incrementing enough. It is always somewhere between 0.1% - 0.2% less than it should be. I know it's not much, but it is a bug. It happens nearly every TLA pack I open. I can only say that it is a bug for TLA, because those are the only packs that I have opened of late, but it be occuring across other sets as well.