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Operand (MI) not in use, but in output window shows in use

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Good day,

 Opened an old project and try to use for new system. Some of ladder and HMI content erased, erased operands not referenced in project, but there is strange thing: some of MI in output window are showing with descriptions and there are check marks (in use). When clicking right mouse button and selecting "find...", shows "search is complete. the are no results to display". I don't get it what's wrong? I deleted ladder and HMI content with these variables and now there are none of them in project, but why they are shown as in use? Please help.. Thank you.

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