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You might have an air bubble still in the system during the change/bleed process.
Just keep driving the car around. Warm it up, drive the car around, actually rev out/redline the car out a few times, run the heater system, check it again overnight.
You can continue to top it off at the radiator until it stabilizes - keeping an eye on the overflow level. If the overflow level starts to rise over time, then you know the system is pretty much at capacity/topped up
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