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Hey there Capt.  If you have your SWR meter after the radio and before the amp, IOW the swr meter between the radio and amp, when the amp is off and you read the SWR you are reading the SWR of the antenna, just as if the amp was not in line.  As soon as you turn the amp on and you check your swr you are now reading the swr into the amplifier NOT THE ANTENNA.  When your amp is on and your swr meter is before the amp you no longer can read the swr on the antenna.  You can only read the antenna swr when the amp is OFF.  If you move the swr meter after the amplifier you will ALWAYS read the antenna swr and it won't change.  I think this is where you are getting confused.