Well, you have a few options (warning, Spoilers):
1: go normal on Duty-Story and hope it works. Maybe make a save befor you start.
2: do the normal Sinner-Story and THAN try to join Duty. Worked for me.
3: go "Deeper in the Mines" and make contact with the sinners. Than leave the mine as said on your PDA. You will get the "Contact Sakharov"-Quest and so you can play the normal Main-Questline.
Than you can go to the bar and try to join Duty, without working for the Sinners. Duty-Quests will still be mixed up and maybe you can not complete the last quest. Also, you will have the Sinner-Quests left in your PDA and all your Stuff, that Weles take when you meet him first, will stay locked in the Sinner-Box, so maybee drop it off before.
I also had a lot of Mods running, so maybe if you play Vanilla, the Quests will be in order.
If you run on Vanilla, pls tell me how it worked ;-)
Decadef
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