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When I still used my old 130mm scope, I almost never used the 10mm EP that came with it. I still have it in my kit, occasionally pop it in a scope to remind myself how hard to use these things are!
They are designed to be used for higher power, but applying the principle of TANSTASFL ("there ain't no such thing as a free lunch" for anyone not familiar with the works of Robert Heinlein), everything has a cost, and the price of higher magnification is a much tighter focus point, increasing visibility of poor seeing (atmospheric distortion) and tighter eye relief.
It is probably nothing wrong with the scope or eyepiece, simply a consequence of the laws of optics! So relax, use the 25mm and enjoy the views.
Malcolm
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