Salvin Adjustable Torque Wrench: Differences for Upper Teeth?

I do not have much experience with screw retained implant crowns. Â Most of the crowns I have done are screw retained into the Nobel Biocare Replace select [i.e., UCLA type implant crown which screws directly into the implant fixture]. Â I was advised by my surgical mentor to use Salvin torque wrenches which click when the desired torque level is achieved preventing over-torquing the screw. Â I did find them easy to use and clicked once the torque is achieved. Â All my cases were in lower left hand side. Recently I tried using it on upper right hand side second premolar region. Â I could not tighten the screw using the clock wise movement as they suggest. Â Indeed any direction I moved the wrench ,there was no tightening. Â The screw driver was engaging the screw well so that was not a problem. Â I am not sure if there is any difference to using it on upper teeth? Â Can anyone explain what is going on here and why I am having this problem?