Not sure about the meter, but.... we have net metering here in MD. I've been noticing a departure between what the grid operator tells me I'm banking to the grid for a billing period, and what theTesla app tells me I've banked for the same period. It appears to be an accumulation of rounding practices - BGE rounds each daily number to whole kwh, and the app rounds to 10ths of kwh. Daily exports with less than 0.5 kwh are tallied by the app, and dropped by BGE. There would need to be a lot more daily exports getting rounded down than up for this to make a significant difference though (which seems a little odd), so I'm not certain this is it.... 10 kwh seems like a larger noticeable difference than rounding might make tho, in a billing period. Maybe annually....
I've noticed a few smaller discrepancies between app reporting and my own numbers, which are simply accumulated records of daily numbers out of the app.