My guess would be that the light fixture didn't seat itself completely in the electrical connector when you pushed it back in, or it is corroded, I'd pull it and reseat it carefully - be sure not to bend any of the pins when you push it back in... this isn't uncommon.
Also, there's a good chance that the other bulb will go in a short time, so be prepared. This is because of two things - both bulbs have the same number of duty hours on them, and the new bulb will have less resistance than the old one and send more curent to the other 'old' one still in service causing it to burn out more quickly.
Another good reason to replace headlights in pairs is that headlights dim over time and replacing only one will usually give you uneven illumination which can cause eye fatigue when driving at night.
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