Huge 445,000-step count in 15 minutes - any way to correct?

Unfortunately deleting the all-day metrics was removed from Garmin Connect already a longer time ago. You will have to contact the Support and ask them to do it for you.

Good Luck with this. My Venu 3 reports that I climbed 14 flights and descended 11, all while just taking a walk on flat ground. Since the last 2 updates many activity reports are way out of whack. Sleep reporting has also been problematic. When I first purchased the watch, the reporting seemed more accurate until a series of updates starting around April or May. I am basing this on subjective factors as well as having owned a Aura series 3 ring concurrently.I have contacted Garmin Support on four occasions.They had me do a data dump after my third contact. Unfortunately, reporting from this watch and app are just as unreliable as ever and there have been no forthcoming solutions as yet.