yes fend is bugged. I'd say, read the stikies though for some reason, it isn't anywhere in the stickies, or is it?
What come to my mind.
Fending with a big spear is bugged at a strange way when you d/e/a in a fend cyclus. the idea is that on the server you stop fending, though on the client, you don't. This means that if you keep the button of your mouse pressed, the client will let you attack though the server will let you stand still. So you don't leech, don't attack and you don't have a shield to protect you. This is a bad thing.
Will all fend cycluses miss? It depends. If you keep the mouse button pressed for a long time - i.e. you start attacking the first wave at baal and release the button untill the next wave, you'll d/e/a and all the attack in that wave will miss. I't only after you release the button after the first wave, you can start attacking again. On the other hand, if you repress every cyclus seperated from the other cyclusses. The bug will only be in effect for one cyclus.
So you have two option. No d/e/a and no valk. You don't have any problem with the bug, though you're missing a valk. Or you can put 1 point in d/e/a, try getting not to much +passive skills and use a valk and decoy. The idea with this last build is to stay behind valk, merc and decoy so that monsters can't attack you. If you aren't attacked, you don't bug. I theorie it works, though if you aren't a good player - as I am - it is very hard I guess.