Pre Boil and Original Gravity are the same!! Why?

[BigEasy]

I just finished up an IPA and took a pre boil gravity reading and it came out to be 1.040 at 69F, after 60min boil and cooling down the wort I took another reading and it was 1.040 at 65F. Why is this? Did my boil not boil well enough? Any suggestions would be great because after 5 hrs today and getting to the end it's a little disappointing. This is the my second time doing the IPA and didn't have any issues first time around. Thanks

[robcoombs]

This sounds like it should be impossible. Maybe a hydrometer issue? Do you have another you can try, or know someone close and try theirs?

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[bluenose]

I also wonder if there was any trub in your sample that might be throwing off your hydrometer

[CartoonCod]

Was your wort mixed before you took the sample? If not there could be higher density wort (ie: more sugar) at the bottom than at the top. This happened to me once when I didn't mix the wort after mash (BIAB) and took a sample from the ball valve near the bottom of the pot.