Strange pressure readings

[essexboy]

Hi Guys,
While doing some AOL testing i came across some strange pressure readings, all the rounds were the same load, same bullet, same primer etc just the AOL was different 1st load 15 thou off lands, hard bolt lift heavy ejector mark
2nd load at lands, sticky bolt lift light ejector mark
3rd load 15 thou in lands, no bolt lift no ejector mark
The rifle is a 6mm dasher, the load is 32.6g n540, 105g lapua, cci450 primer.
I was expecting the pressure readings to be the other way round, any ideas?

Regards

Steve