The TS 570D is driving the amplifier which shows an excellent load for
the TS 570D!!

The amplifier is driving a different load with a 4:1 VSWR. This is a 36%
reflection of the power. If your Amplifier is vacuum tube with tuning
controls it is not a serious condition. You can vary the loading
controls for reasonable output without damage. If your amplifier is
solid state then you have to do something to correct the VSWR because it
presents a load to the amplifier that is outside the designed load range.

Deacon Dave, W1MCE