But the left would still say "Cold" so one has also to reverse the taps or at least the part with the words "Hot" and "Cold".
The little caps will spin out and spin back in. Those just cover the screws below.
Looking at the faucet below, the hot stem is installed on the correct side, it's just the caps that were moved. That and the water was crossed in the wall. Water being crossed in a wall is much more common then people realize. Some plumbers using products like Moen don't bother too much about it. They would rather have fewer fittings in the wall, and spin the cartridge to correct the hot side output.
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