Looks like they did a bit of premature rounding:

the difference between 38℃ and 94℃ is 100.8Δ℉ rather than the 100Δ℉ that was probably there in the original markings. It's the closest you can come to the correct values though, 93℃ is off by 1Δ℉

They then assumed 100Δ℉ = 56Δ℃, and applied that to the rest of the dial.

That means the values on the dial are off a bit, and should be: 38, 93, 149, 204, 260, 316, 371, 427