The bladder is the rubber thing when you take off the resivour cap. What it does is it allows the fluid to expand and contract with out letting air in. Now if it is torn or anything like that then you'll get air into the system. In my opinion....I'd try and bleed them again and ride them for a week or so and see how it goes. It's hard to firgure out where the oil is coming from with out seeing it. Is it coming from around the bolts under the cap? Or is it coming from around the blots on top of the cap? Did the bolts get overtightend and cut the bladder? I mean it could be as simple as the bolts just got a little oil on the threads when the shop bled them and the oil you see is just from that. It's hard for me to say with out seeing it. I really hope I'm not making this to difficult!
Like I said before if you can bleed them again and take em out and ride em for a week and then see what happens then.
