Is this true? OPK + HPT?

Someone told me that if you put an opk too close to a hpt, you'll get a fake positive hpt. I had kept getting positive opk's, so I took one and a hpt at the same time and put them down. I got a very faint but obvious BFP on my hpt but after my friend informed me on that, now i don't think it's a real positive. :(

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