yeah. i’m pretty sure it has something to do with dates that fall outside of 12PM to 1PM and 12AM to 1AM. i noticed the problem first on this the observations from this person in my area, who i thought was maybe just inputting dates without time, but if you go back and look through that person’s observations (https://www.inaturalist.org/observations?page=2&place_id=any&subview=table&user_id=das43), it looks like anything within those time ranges is showing up with time. note that his problem didn’t just start in March.
maybe there’s some sort of weird logic that is trying to do special parsing of 12AM and 12PM (because they technically come before 1AM and 1PM, respectively), and maybe that logic is broken. why it only happens for some users and only for some date ranges, i have no idea.