[RESOLVED] Blocks discarding cards

It happened to me a few times already. But this time I have a proof:

1) I attack an opponent. (Clumsy Chop in this case)
2) My opponent blocks it succesfully. (With Deffender's Block in this case, but it already happend to me with other blocks as well.)
3) Somehow it discards my oldest card. (Deffender's Block in this example...it costs me the game btw...)
4) My opponent then draws a cards as he normally should.
5) This point is for amusement only: My opponent then followed with Pulverizing Bludgeon supported with All out Attack and sent my Dwarf to Valhala. hahaha

Any idea what's happening here?

 

Read Clumsy Chop carefully.

 

Wow, thanks. :-D How can be that I haven't realized it before.
Now it makes much more sence, haha.

 

Got to work on that clumsyness