If I recall correctly, Zwift made a change maybe 6-12 months ago where wattage targets for workouts were rounded to the nearest 5 watts, at least in the intervals list on the left.
But I think the actual wattage targets didn’t change. Which leads to situations like this:
My actual wattage target was 278. But Zwift displayed it was 280. Gotta say, it kind of drives me crazy, because I’m in ERG mode and can’t get the trainer to hit 280 for more than about 1 second at a time.
I would suggest making the numbers match. My preference is to have them be exact (so 278) but if Zwift likes the “simpler” look of rounded numbers, then change my actual target to that rounded number too please!