When i cut a circle it is not completely round it is slightly egg shaped
On what type of material? Does the preview look good? Attach copy of lightburn file.
Draw a square, e.g. 100x100mm and measure the cut out/engraved result with a caliper.
It is possible that your steps do not fit. Has it been ok before? If so, then it is more likely a mechanical problem with your belts or pulleys.
In addition to the other suggestions, verify that Rotary Mode isn’t enabled: