lots of things going on here.
first, look at the observation detail screenshot that you posted. the submitted date will reflect the time zone of the device from which you’re viewing the observation. so in this case, your computer is probably currently set to CEST. the observed date – assuming the date came from photo metadata – will reflect the local date and time recorded by your camera, but it will ignore the time zone (offset) recorded by the camera and instead apply the time zone that you had set up in your iNaturalist profile at the time of upload (without translation from the camera’s time zone). so in this case, the timestamp (2020-03-05 14:42:50 -800) from your camera (which appears to have been set at Pacific time), was recorded to the observation as 5 Mar 2020 2:42 PM JST (which means your iNaturalist profile was probably set to JST at the time you uploaded this observation).
now, on the Explore list view, the observed date shows up as 5 Mar 2020 10:42 PM JST. that appears to be a (mis)translation of 5 Mar 2020 2:42 PM JST (+9) to 5 Mar 2020 10:42 PM CEST (+1) without changing the time zone that is displayed. in other words, this screen should either show 5 Mar 2020 2:42 PM JST or 5 Mar 2020 10:42 PM CEST. so there’s a bug on this screen. (i’m not 100% sure, but this might be related to the problem reported here: https://forum.inaturalist.org/t/daylight-savings-time-not-shown-in-list-mode-on-website/21283 , which had a recent fix, though i’m not sure if it was deployed yet or not.)