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.
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.