So as soon as I walked out of Proudspire Manor two Cultist Adepts came up to me, anyways after a brief exchange of words an exchange of blades and magic followed and I emerged victorious.

Anyways hours later their corpses are still in Solitude and a bunch of kids keep acting like they're doing a vigil for the fallen cultists. Does anyone else have this problem?

Yes, the cultists in my game have yet to clear out of the city I killed them in.

I have the same problem. It seems the programmers must have left out the clean-up script like they did with so many other npcs in the game.

They do not clear up, I raised them from the dead, unrelenting forced them into the river and shot them with my bow. They are now ash piles sleeping with the fish, out of sight out of mind.

I put my cultists in my basemant to go on top of the rest of my corpse pile. What?! You collect books. Ill collect my corpses!

I guess these are like the thieves in Riften that just would not use to clean up till they patched it