That, I couldn't tell you. Do you have another TC mod to test it on? Or even see how it vapes in wattage mode, I guess, to see if it's the build or the TC function on the mod. Sorry to not be more help, I just have no idea, honestly.
Did you try putting it back on the ohm's reader and test fire it a bit? Jumping resistance on an ohm's reader would tell you if it's the build. A leg could have come loose from the deck or something.
IDK, because it could also be an electrical fault, if you don't have an ohm's reader you may need to physically check the build and see if anything is lose, or if you haven't quite snipped enough of the coil leg off or whatever.
Good luck, hopefully someone with that mod will be able to tell you any "special things to know about TC with it" or something.
I'd probably start with the build, since you aren't running into much luck with figuring out if you are doing TC incorrectly somehow or if it's even the mod itself, and an electrical fault.
Good luck,
Anna