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Sounds like a focus issue, as already suggested.
If turning focus one way makes it blurry, turn it the other way until you see the image getting smaller, then you are heading the right way and keep going until it is clear.
Also, make sure you start with the 25mm eyepiece, being lower magnification, it should be easier to get to focus.
Then once centred you can switch to the higher magnification 10mm, if you want, for more detail.
This will then require re-focus.
Good luck with it and happy viewing
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