Has you timezone changed between 18th Jan and today?
What happens if you create another item with exactly the same repeating settings?
What happens if you edit the start date, for example set it to 19 Jan?
Do you have several items that have this issue? What do they have in common?
This bug indeed presents after a timezone shift. I think it affects items with a specific kind of repeating rule, that is, n-th day of week.
A proper solution is being developed. For now, a work-around for the affected items is to edit the start date. For example you can set it to one day earlier than it was before - the point is to simply overwrite the old (incorrect) value.