Military and industrial organizations require all torque wrenches be calibrated before use. They do not trust the manufacturer.
Your wrench seems to be NOT correct. It should take about 30 pounds on a two foot wrench to apply 60 foot pounds. It would be 45 pounds for a 1.5 foot wrench.
I have a click type torque wrench. I needed 90 Ft Pounds to tighten WDH mounting bolts. It work fine until it didn't.
Not thinking straight I increased the force until the brackets bent. Later the wrench started working again. I now spend a little time estimating what force is expected before applying force.
If you have applied 250 foot pounds to critical 60 foot pounds mounting bolts, you may wish to replace them. Get exact replacements from the manufacture unless you know how to select proper replacements.
I wish you good luck and happy trails ahead!