That can't be right unless the product is somehow old or compromised. I'd take it back to Turners and get some new stuff, I'm sure they'd hook you up...I use PowerPro all the time and haven't had any issues. Although I often use a certain type of mono without issues & my last spool sucked. There's bound to be bad apples. Also, most lines test higher than their stated strength...you've seen it before I'm sure -
"dude, 8 pound >insert brand name here< is the best! I got snagged on a rock and it anchored a 65 foot yacht!"...