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@rpm
+1
Or always use a good quality track pump, they don't have to be expensive: £35 at Decathlon.
I do find it amusing when people spend £1000+ on a bike yet refuse to spend more than £10 on a tyre or £10 on a pump.
Re the OP, some pumps (like the joe blow) don't have a very good cylinder and although they will pump up to 160PSI they don't like pushing through the valve at 100+ so you have to deflate to 50 or so to start the valve and go back up again. The more pressure there is behind a presta valve, the harder it is to depress the top cap therefore opening the valve, not all pumps do this adequately when there is already high pressure in the tube. The type of head on the pump can be a problem with this.