On guard message from different region?

Hi all, first time poster.
I was on on the ATC playground, London region, flying between EGLL & EGBB and received on guard message from Paris Charles tower, then again this morning, Amsterdam region, on final to EHAM, when I received on guard message from London Gatwick tower. Just wondering if anyone else has experienced this?
Thanks Lot1

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I think it’s because those regions are so close together, when I’m atc in London region I can see planes from one of the other regions.

You can see planes on your map from any region, but nearby regions can be easily found.
It should have happened on the playground, right ?