Were the 2 gauges of the same type ?
Do you have your own gauge ? you should as it is the only way to get a reliable reading.
For a pressure gauge to work it must depress the Schrader valve in the valve stem when pushed on.
Sometimes the Schrader valve is so deep in the stem that a gauge will not depress the valve so you don't get a reading on the gauge.
Try a different type of gauge and practice on the front wheel as there is more room to move, when you find one that works stick with it.
Some of the 19 rides in my shed
2014 V2, Snoopy
2009 Wee, Pumbaa the pig
WR450F, The Blue Postie Bike
YZ250N smoker with rego, Stinky.
Yamaha MT09 (FZ09), The Scud missile.
Club Lead not Club Med.
He with the most toys wins.
Out of my depth in a puddle.
Live life on the edge you will see more that way.
Ridding a motorcycle keeps things in balance.
At the end of each trail and at the end of each day history is made.