Possibilities
Hello,
What is the knot? What was the application? Under sufficient load, the HM core can crawl right out of most knots, putting the load on the core. After that, the best stress riser wins.
Or, it is possible that the cover and core weren't balanced at the factory. It happens. In this case, the cover would again take all the load at the cleat.
Or, the cleat itself, and/or how you belayed to it, might be the culprit. Or all of the above.
Fair leads,
Brion Toss
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