Not that unusual actually. I have some pretty sensitive tuners here at home, that are affected by people walking around in the house, and outside.
Radio signals are not all that strong and can be affected by just about any matter. Everything around you can act as an antenna, including your own body. Proximity to the receiver can affect the reception.
Ever grab hold of the antenna and notice the signal either lost entirely? The opposite can happen too. Grab hold and suddenly there is a signal, let go and it's gone.
It's actually a very common phenomenon.
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I'm not likely to be around much longer. As before when I first signed up here years ago, I'm finding that after a long hiatus, and after only a few days back on here, I'm spending way too much time here again already. So I'm requesting my account be locked, banned or whatever. It's just time. Until then, well, I dunno...