I’m pretty sure the TG-4 doesn’t record horizontal accuracy, so this wouldn’t be a bug with iNat. I have that camera, but unfortunately lost the annoying proprietary (grrr) charging cable so I can’t test with it.
I’ve also seen it record some wildly incorrect locations so I ended up just turning off GPS in the camera (saving on battery as well) and using my handheld device for geotagging.