555 delayed after threshold goes above control voltage

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mozobata
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555 delayed after threshold goes above control voltage

I am messing around with some 555s I bought a while back (NE555N from
STMicroelectronics) and I'm getting some unexpected behavior. I have a
capacitor hooked up to both the trigger and threshold pins in order to
give me a basic oscillator. The issue I'm having, however, is that once
the voltage across the capacitor reaches the reference voltage and goes
above it, it takes a fairly long time for the 555 to switch states, and
much longer than it takes to trigger when the voltage drops below 1/2 of
control.