Explained here: No High/Lows, where is history and graphs data used for, and ? cron ?
WU by definition old data (2-6 hours old) => Graphs => do not need near realtime
live-data => cron-jobs => History => max 5 minutes old
Your screenshot => high-lows are store in history.txt
Clean those values pwsWD/PWS_hist_update.php?pw=12345
Wim