Power Pro Spectra Question

[Billy V]

I have been testing a few knots at my workbench and have experienced line breakage on my Power Pro #65 lb. WTF.....

This is what I did:

-I tied a 2 ft. section of #30 lb. (Used Ande Mono) to a metal ring on my vise using a San Diego Jam Knot.

-Then I tie a 38 turn Albright Knot to make the connection between the 2 ft. piece of #65 Spectra to the Mono.

-Then I tie a double Palomar Knot with the #65 Spectra end to another metal ring and make a steady pull to failure.

The Power Pro Spectra fails near the middle of its length every time.
WTF...... Has anybody ever tested their line like this before ?

The line is a few months old, but has only been fished 3 times. Its not rotted.
All the knots held just fine.