Percentiles p50, p95 and average show the same value

when displaying percentiles from an elastic (kibana) time series p50, p95 and average give me the same value.

my settings:

while excel calculates:

average:1954,11
median:1951,50
p95:2354,75
p50:1951,5

Grafana v7.4.2. Any body any clue ?