While I should not personally be affected by this at all, I'm going to write it up in hopes that it provides a clear picture so it can be fixed quickly, and to help players having problems.
TR main and off hands are practically interchangeable unless you have an item with a weapon enchant slot, which can very specifically only be equipped in your main hand. Even the auction house shows no off-hand items for TRs, lumping them all into the main hand category.
If you have an item in your main hand that the game reads as an off hand, you cannot dodge. All classes cannot dodge (or block) if they have no weapon equipped, but the TR is the only class that can *look like* it has a weapon equipped when the game actually thinks it doesn't.
I don't know if there's a homebrew solution to the problem beyond making sure that the item in your main hand is one that the game will read as such. Main-hand daggers point right and off-hand daggers point left, if getting an item with a weapon enchant slot is not an option for you.
This thread can also help identify weapons that should work for levelling players.
http://nw-forum.perfectworld.com/showthread.php?831941-Master-List-of-Item-Types-by-Quest
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Neverwinter Census 2017
All posts pending disapproval by Cecilia
For some reason he has posted the same reply in multiple treads, no idea why.