If your cycle is short (less than 23 days) AND trackle could not yet detect a temperature peak, trackle will not start a new cycle as soon as you enter a bleed.
This is due to the fact that it could also be spotting around ovulation, which would be a sign of high fertility.
Therefore, initially, no new cycle is started in the app and trackle continues to wait for the existing cycle to see if ovulation occurs and indicates that it is a fertile day. The cycle will then be analyzed as usual and trackle will start a new cycle when you enter your next period.