My home shows open ground on all my receptacles including the GFCIs.
I live in a 21 year old home, what the heck?
What do you mean shows? are you a home inspector?
I’m going to be soon?
Just to be sure, try another tester. Might have a burned out light bulb.
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It’s a brand new tester.
Lol, it’s made in china so…
I bought 3 from Menards when I first started and had to return 1 because it didn’t work at all.
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Wow, just pulled it out of the box and its Klein??
I ain’t saying for sure it’s the tester, just a possibility. Do you have a regular tester like the one below? If so just go from hot to ground and see what it says.
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Also, wiggle that tester around if your receptacles are old and well-used. Sometimes they don’t make good contact.
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Check ground connections in main panel. I assume you have wire that has a ground?
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Well one “good” thing is that GFCI’s do not require, or need, a ground.
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A 21 year old home should certainly have grounded receptacles.
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Best advice for the next step IMO. Or check a neighbors with the tester to verify it’s operable. From there, since I don’t know your skill level or safety training, call an electrician.
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Welcome to our forum, Mark!..enjoy participating. 
Unless you’re comfortable removing the panel cover and pulling a receptacle out of the wall this is good advice. Otherwise first check the tester on a known good receptacle. If you’re up to the task test a receptacle that shows an open EGC, shut off circuit, pull the device out of the box and take a photo. Then remove the panel cover and take a few photos. Post them here and we can probably diagnose the problem.
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The ground on the tester may be broken. That sometimes happens. That is why I carry multiple testers. When one goes bad, it goes in the trash and I grab a new one.
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Also for when you show up at an inspection and realize you left your tester plugged into a receptacle at yesterday’s inspection. 
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A solenoid tester (wiggy) is your best backup. Learn how to use it.
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Open an outlet and look.
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Isn’t that dangerous?
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