I have a big Problem with the X-Axis

here is my result :


with this query :

from(bucket: "DBANDY1")
  |> range(start: v.timeRangeStart, stop: v.timeRangeStop)
  |> filter(fn: (r) => r["_measurement"] == "Ventilator_gestern" or r["_measurement"] == "Kuehlschrank_gestern" or r["_measurement"] == "Imac_gestern" or r["_measurement"] == "FeFo_TV_gestern" or r["_measurement"] == "Drucker_gestern")
  |> filter(fn: (r) => r["_field"] == "value") 
  |> window(every: 1d)
  |> group(columns: ["_start","_measurement"])
  |>last()
  |> group(columns: ["_measurement"])

equivalent to this single line
|> aggregateWindow(every: 1d, fn: sum)