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Actually, the situation is the same as with everyone else. Sheltem doesn't want to leave and has no intention of doing so. I also noticed a peculiarity on the map: the AI is very weak, regardless of the difficulty level (I played on easy and normal). It seems that after patch 1.8, instead of fixing errors on the map, there are even more of them than before. Judge for yourself: "- In a tale of two Guardians map, the Lord Xeen’s army is triggered too early and it is too aggressive." - this is the description for the patch. It seems that instead of making the AI a little weaker, they simply disabled it, which is why Sheltem isn't moving.
This is indirectly confirmed by Liiion's words about completing the scenario before the patch. That's the situation =(