Why is liquid coming out of my burettes at an angle?

I have cleaned the taps but the fluid doesn't come straight down. It is at about a 22 degree angle.
Nothing to do with tap, the fluid isn't flowing out of end cleanly. There must be a small blockage in the end of the tube or the end is damaged/chipped. Look at it with hand lens or under microscope low magnification.
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Clean by forcing water back up the tube
 
soaking the tips overnight in water will very often dissolve any blockages. A balloon pump on the wide end will also blow out debri. You may need to add a small length of tubing to the pump to get a seal.
 
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