Problem with dual led flasher 555
I assume you mean that the LEDs have internal current limiting so that they can be operated from 12 volts.

When the 555 output is High, its output will be about 6 volts - well below the 12 volts on the BC327 emitter, so the BC327 will always conduct, allowing its LED to light.

When the 555 output is Low, the current through the BC327 emitter-base junction, and its 220 Ohm resistor, is apparently enough to pull the 555 output up enough to allow some base current into the 2N2222, so it will draw some current through its LED.