To reproduce this bug, prioritise TDNT over ESL (Enhanced Strong's Lexicon). Now open DBL, and click on a TDNT link. The link will open in ESL, rather than TDNT as it should. The screenshot below shows my prioritisations, and if you look at the right click menu, shows that ESL is being acted on above TDNT, despite TDNT being priotirised above ESL, and even despite TDNT being specifically selected for TDNT links.

The problem also occurs on other systems with a much simpler resource prioritisation.
I've checked the problem is several resources (DBL, Hermeneia commentaries, Eerdman's Critical Commentaries,NICOT/NICNT) and the error occurs in each one. But it does not occur in the Anchor Yale Bible Dictionary. I suspect this is because the AYBD hard links directly to the TDNT resource, rather than using the TDNT resource type as it ought to.