Hurst Cycles vs SentientTrader

Questions: 1) I am subscribed to both Hurst Cycles and SentientTrader. It appears that the two programs pin troughs and peaks differently!?! Do they use somewhat different programs for cycle analysis, or …? 2) I tried in ST to pin 20 week low in late June as David did in recent video on Aug 5, but the analysis failed! Any hints? TIA, Brana