Strontium too high?

[asylumdown]

I bought the seachem strontium test ages ago, but it was so complicated I've never bothered with it until now. I'm certain I did every step right (twice now) and I'm getting a reading of 60mg/L. Everything I've read says that's way high. I used to dose small amounts of liquid strontium, no more than once every other water change, and less than the recommended amount on the bottle. I haven't dosed any for weeks though.

Can this test possibly be right? Is a reading like this dangerous?

[Bloodasp]

If the test kit is old I would say it's skewed.