I'll give you one guess.
Here's a link if you want to cheat. Scroll down to the map and click on Arizona.
Yup, I figured as much.
A number of large batches from Maricopa count recently went for Trump at an average of about 56 percent.
If they’re cheating, they’re doing a lousy job of it, at least for the past 3 or 4 days
Dominion Voting Systems abbr DVS aka DeViouS; the choice of cheaters
It really jumps out at you when you compare (as per Wikipedia) Hillary’s total for Maricopa in 2016 was 702907 and Biden’s is supposedly 1,027,269, with an improvement of nearly 325000 votes in that area alone (Trump’s total for the same area went from 747000 to 980000 for a gain of 233000 votes).
Somebody on another thread blamed the “Cindy McCain Country Club Republicans” who hate Trump for why Trump is behind. However, his vote total for Arizona increased by 400k, so it means that his overall support did not crater at all due to these sorts of people. But you have another large urban area (Phoenix in Maricopa) showing this sort of big jump in support for Biden not at all dissimilar from Detroit, Atlanta, Philadelphia, and Milwaukee and elsewhere like that.