Hi Emmo, maybe normal behaviour. If regatta is 5 race min and your results in first 5 races are 5,2,1,3,2. If your 6th result is better than your first result, then your best sequence of 5 consecutive races improves. Your score will increase, and the number of races will indicate that you achieved your best sequence in 6 races.
If your 7th result is a first, it will improve your best sequence of 5 consecutive results, and races will indicate you achieved this in 7 races. However if your 7th result is worse than or equal to 2nd, then your best sequence will still be from races 2-6, and so