There seems to be a problem in how discounts are calculated for bundles. Take the Activision Hits 2 bundle. It says pick 10 for the full discount, but why am I penalized for picking more than 10? I would prefer if I was encouraged to complete my bundle by buying the other 3 games I am missing.

Yeah, that bundle is borked for me too. I select the 2 games i don't own and the discount goes to 0.

That is certainly a bug. Write to support about it and it will be fixed on Monday, perhaps even earlier.

Writing a PM to a blue who is online might help getting this fixed faster.

Are you sure ?
This was posted 4 hours ago : https://www.gog.com/forum/general/the_monstrous_winter_sale_has_arrived_98beb/post294

I failed to see that they were already aware of the issue. Any way to delete this thread?

You can contact a blue to lock the thread.
No way to do it yourself I'm afraid.

I haven't seen that post before but the way I understand it it confirms exactly what I said. Or how else would you understand the words: "We know about this issue guys and are working on it! Apologies!" ?