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TPS7A4001: TPS7A4001 dropout voltage

Part Number: TPS7A4001
At the input of the LDO I have 70V.
I put an NPN (PHPT61006NY) at the output of the tps7a4001 regulator to have a stronger current.
Idle LDO with no load works as it should.
once I put a 1kohm load at the output. the output voltage crashes; it goes from 61v to 50v. even the FB goes from 1.18v to 0.96V.
Is this behavior normal?
thank you in advance.