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More than likely the tape was played back on a machine with the wrong head for the tape in question. My suspicion is that the tape is actually a 1/4 track tape being played back on a 1/2 track head. This will give the exact symptoms you describe.
My advice is to seek out a professional that works with tape on a regular basis. That person should have the tools to look at the magnetic pattern on the tape to determine tape format and the correct machine/head combination to play it back.
All the best,
-mark
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