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I dont have any experience with these items but I do know about threads and pitches. There are 2 metric threads, course and fine. Course thread at 48mm has a pitch of 5mm, pitch means how far apart the threads are, so I would say it is not that so it must be a fine thread which has a 2mm pitch. It should be easy to see if they are different.
The fine pitch threads are easy to cross thread and if this is the case it can be tricky to fix. I would suggest to take it to someone and try it in another eyepiece or try another filter and see which one has the problem.
Mark
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