I'm playing a heavily modded playthrough and i've gotten the quest "Ill Met by Moonlight", everything was working fine until upon entering Bloated Man's Grotto Sinding was not there. The quest marker pointed to the Falkreath Jail and when i got there he was at the spot he was before i got the quest (but in werewolf form) but would not approach, i tried using tcl to get to him and he spoke his line from the quest but it didn't do much besides that.

I tried going back to an earlier save, before i entered Bloated Man's Grotto but it didn't help much too. I tried using console commands and found he is still in his cell, but invisible. I tried using the commands to teleport him to the Grotto but that didn't help either.

Anybody has any idea about how i could fix this?

Load Order: http://pastebin.com/WqSvv6BD

So... I went back to a save game before i got the quest. I noticed that talking to Mathies didn't give the quest in my journal but the quest stage did change. I them proceeded to talk to Singing again. I waited for the full animation of his espace to play and them waited some more. I then tried to use the player.moveto command to move to him and again he was in his cell but invisible and impossible to interact. Is this correct? Will he be teleported to Gloated Man's Grotto later on the quest or is this a bug with one of my mods?

That is a huge mod list and very unsorted. I would look at culling the list and sorting properly.

It was sorted using LOOT, i didn't mess much with it besides what LOOT done to it.

Ok, LOOT, I must admit I am unfamiliar with the new mod positions.