iPhone Calendar Bug. New Events are occasionally defaulting to the wrong day. Please advise.

This seems to have started on iOS 17.4.1. I do not know if it is only because of 17.4.1, or due to the fact that the calendar is both synced to my e-mail, and the cloud. Yet events that seem to be synced to the cloud, seem to have an error that they will copy prior event patterns:

examples: some of certain events were programmed for some certain time slot, while some of them were previously programmed for another time slot.

When I enter the same events to sync with the cloud for the current day, the iPhone Calendar will default frequently to program those events to the next day. If it is between 5 pm and 6pm Tuesday, it puts them on Wednesday, yet sometimes it may be that it is 5:30 Tuesday, and it will allow me to keep it on the same day.

I do not understand this bug. It appears that if I previously had a time slot on a previous week, it allows the same day or next day, and I may have to change it. Any advice will be appreciated.