Humble keys reobscuring themselves?

Yes, it has happened quite a few times for me. You can even send out a humble gift link with these re-obscured keys, but the gift link will just give you a used key.

That happened but if you reload two times the page you can see it normally.

I just know that if I activate my keys, HB will still list them as available keys for many hours

I have the same problem recently with Saints Row Ultimate franchise pack. I've bought the key in november 2014, actived it and now it seems recovered but without the gift icon. I know some keys are hidden again after reloading the page a second time but this one remains.

When I've bought the pack, "Gat out of hell" was not available into it but now it is, so I wonder if Humble Bundle provides another key or it's just a bug... Did anyone buy the pack on the humble store and have the same problem?