Why does Showfile change when backup comes online

Hi 

I have a Eos console as a main, and an Ion acting as backup. both running 2.3.3.9.0.10.

when the Eos has loaded, and then transfers the show to the Ion, the current showfile gains an * asterisk, saying something has changed.

can anybody shed some light as to why this maybe? This has not happened before, and i presume a back up console coming online shouldn't have an effect on the file in the main desk??

many thanks for your help

james.

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