There is a stop that limits the travel either on the threads or somewhere underneath. There is probably a hunk of sawdust that is preventing the full travel to 90 degrees. On older saws there is a set screw in the miter slots on either side that limits the travel to 45 and 90 degrees... your may have them? Dig out the manual or download a free copy online.
If it adjusted to 90 when you got it I would agree with the sawdust scenario. Turn it upside down and blast it out with an airhose after setting the angle to some midpoint to expose the stops. A bit of work with a brush may be needed.
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