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You don’t have enough base drive to turn that transistor fully on, 33k is way too large. How did you arrive at those values?
Don't use random schematics from the internet.I just saw them on a circuit on the internet.
I see no decoupling capacitor at all. Don't know about your GND plane and trace lengths.13.1 Layout Guidelines
The VCC pin of the LM567 should be decoupled to ground plane as the device can work with high switching
speeds. The decoupling capacitor should be placed as close as possible to the device. Traces length for the
timing and external filter components should be kept at minimum in order to avoid any possible interference from
other close traces.
My datasheet says V8 can range up to 15V. Anyway, missing supply bypass is a problem.
Sorry I've confused it with VCC absolute maximum value. 15V is correct.My datasheet says V8 can range up to 15V