It's normal. It's a thing called friction and since the back tire carries more weight and it is the drive tire there is more friction and the result is heat. That is the main reason that you will replace the rear tire more often the the front tire, on my bike it's usually 2 rear tires to 1 front tire. Don't worry about it and twowheeladdict is right you should only set the tire pressure when the tire is cold.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.