More power waste with regulated source than RAW

Hello

I'm using an Arduino Pro Mini 3.3V + LowPower library.
When I measure power supplied by GND, RAW at 3.33V or 9V then the multimeter reads 0.16ma
When I measure power supplied by GND, VCC at 3.33V from regulated source then the multimeter reads 26ma

I'm a bit confused. Why regulated source wastes more power than RAW?

Thanks

Because you are back-driving the on-board regulator and its not designed for it - many
voltage regulators (even nominally low current ones) will draw excessive current if the input
voltage is at/below the output voltage.

then, do I need to remove the regulator if I want to bypass it?