what is unusual about a axis

If you are talking about Uranus, then I can help you. Uranus is tilted on it side. So one side is hot and one side is cold. Brr! However, a theory is that scientist believe that years ago something hit Uranus to make it tilted like that. Maybe a asteroid made it be like that. I'm not sure. I hope this helped.

Also it's tilted about 23.5 degrees.
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And so it is. You should listen to Writeacher.

it has bad grammar.

The term "axis" is quite broad and can refer to various things in different contexts. Therefore, it would be helpful if you could clarify which specific axis you are referring to. However, if you are asking about the Earth's axis, one unusual aspect is its tilt.

The Earth's axis is an imaginary line that runs through the North and South Poles, around which the Earth rotates. Unlike the axis of many other planets, which are almost perpendicular to their orbital plane (the imaginary plane in which they travel around the sun), the Earth's axis is tilted at an angle of approximately 23.5 degrees relative to its orbital plane.

This tilt is responsible for the changing seasons on Earth. As the Earth orbits around the sun, different parts of the planet receive varying amounts of sunlight throughout the year, depending on their position relative to the sun. When the Earth's axis is tilted towards the sun, a particular hemisphere experiences summer, while the other hemisphere experiences winter. When it is tilted away from the sun, the opposite is true.

This phenomenon makes the Earth's climate and weather patterns unique compared to other planets in our solar system. So, the unusual aspect of Earth's axis is its significant tilt, which contributes to the diversity of climate conditions experienced around the globe.