I placed a snipe for item number 250610973925 the winning bid was 14.50 my snipe was for 18.00 it was activated and it did not place it, the only other time this service did not work for me was when I had to change my password, why did it not work this time?

You've done it correctly.
I checked and see that there was some network outage during that time.
I contacted my hosting provider and they told me an upper provider had some router upgrade/replacement, which suppose to improve network reliability from now on.
I'm sorry it happened to you, but that was out of my control.

I hope you can find the same item again.