They appear as a result of copying and pasting. As for getting rid of them, !temp reset all isn't a thing, !reset temp is, although even that only resets the temperature of particles, not ambient temperature. What you want is probably something like this:
for i = 0, 96 * 153 - 1 do sim.ambientHeat(i % 153, math.floor(i / 153), sim.R_TEMP + 273.15) end
Though this will murder your fridge.