Are you sure you are struming the G string at the right point? One might be able to fool the tuner by triggering a harmonic on the strings or being too aggressive in the strum.
I would pull the peg and see if the string CAN be tuned manually. It is possible the G string is bad or somebody put the wrong string on there.
Remember that strings can be within about 10% of the breaking tension when in tune.
Also it appears that the thing can detune itself to nearby keys. Make sure you have the dial set correct when you pull it out to tune.
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