In my case it shows 16 of 13, which would make sense as transposed numbers. I bought 13 bundles and with the new one we have 16 bundles. But 19 bundles makes absolutely no sense.

Mine says 17 of 13 and I got every bundle they released. Their math makes no sense.

And you you can wishlist previous bundles. Maybe the bundle most wishlisted will be bringed back, as their faq says:

Q: I missed the current bundle, can I still purchase it?

Unfortunately, once the time has run out on a specific bundle, that bundle is no longer available for purchase. However, we will be bringing back the best bundles every now and again so that those who missed them can have another chance - make sure you watch the website for details on those periods.

That worked! Thanks for the suggestion - I honestly didn't think of that.

I get 17 out of 13 bundles too.

And yes, I've bought all bundles to date. I think.

The collection site is really great and helpful, but I'm pretty sure they gave me the lightning bundle even thought I don't remember buying it.

Weird, I have to check my records...

No, there have only been 13 bundles (the 13th is this Thy Rewardz thing), so the numbers aren't transposed.

Correct, my mistake. I used the overview from the collection page and counted a row too much. In my case it's then 10 from 13 but showing 16 from 13. Maybe they count also other redeemed bundles on Desura? I will try to find an overview about redeemed bundles in my Desura account.

Edit: No information found about redeemed bundles on the Desura page.

14 out of 13 for me, and I missed 3 so that's consistent I guess...

With the release of the May bundle they also disabled the collection page: Collection is coming soon! This feature will be launched soon, so please follow us on Twitter or Facebook to be notified when it launches.

The Rewardz bundle is still on the bundle list, maybe it's a special for the top contributors of the may bundle.