Repeated chords sound different?

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1

Hi.
I’m new to all this, so this might be a very silly question but here we go anyway.

I’ve noticed that repeated chords don’t sound the same. For instance, listen to the beginning of Ground Hog (major version). It’s |G D7|G G| but that last repeated G doesn’t sound like a G, to me it sounds exactly like the D7 in the previous bar.
Are my ears lying to me? What am I missing here?

2

Hi Maarten, could you attach your file? It’s difficult to tell without hearing it.