First remove all bolts and check your alignment by turning a 1" diameter aluminum bar over 4" without live center using a very modest feed (0.002"/rev) and depth of cut (0.001") and the sharpest tool you have. Then measure the taper to check if you messed it up by bolting the lathe to the stand.
This is how I check the alignment of my head stock (rolling daddy method + compensation for bending the stock during turning)