Type separation problems

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: Hello - I'm having problems printing type on a few pages of a newspaper template we use each week. Certain areas of type separate wrong - ie. on the cyan sep the type looks fine, but on the magenta sep it's all tracked out, or in, either across a whole word or just between a pair of letters. It's usually on one of four pages, and it changes from week to week. The typeface doesn't matter, nor does it matter what colour the type is. Black and white print fine though. It's not even consistent between printings - ie. print once and a word over here is goofy, the next time, it's a bit different or another word. Ideas?

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