Graph jump after 2 refresh

dear all

i try to monitor my container with grafana and prometheus and cadvisor . Unfortunately i dont understand why but the graf is jumping randomly and during few seconds until the next refresh i can like a zoom of the first graph . and also is missing a part of the graph at the end and i dont understand why .

do i’ve to do something with refresh params on the right of the top ?

below a screenshot of the missing part of the graph

jump graf :
normal graf : ://