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This is a fairly complex area but it's not so unusual.
- it could be just a temporary blip while some sales go through and in a few hours will readjust itsel
- BA may be splitting off leisure and business travel. The more inflexible tickets may be unsuitable for business travellers. e.g. have minimum stay requirements, whereas BA doesn't mind taking some very inflexible bookings (knowing that a percentage will be no-show).
- there may be married segments behind this
- they may not want to have a group of 4 in D - so they'll extract more money out of them first.
- and an R fare could easily be more expensive than a D.
But the biggest issue that we have to bear in mind is that while we may be looking at just one flight and its buckets, the real world is more complex. If you are doing
NCL-LHR-JFK-SYR [date1]
ORD-LHR-NCL [date2]
then it may well be that only C will compute for that combination for all sorts of reasons.