It appears to be very easy to reproduce - @PinPics, please correct me if this is NOT what you are trying to report...
Create an event for today
Set the event to repeat weekly, same day, for as long as you want.
Save it
So, you should now have an event that is today (30th Jan) and then 6th Feb, 13th Feb, 20th Feb and so on, correct?
Yeah ya do...
Or do you?
Now try using the search for events on those specific dates. Result:
30th Jan - there it is
6th Feb - where's the event?
13th Feb - where's the event?
Where's the February events?