You may notice at times that digitisation requests may appear to be missing numbers in the sequence. This does not mean that a request has been 'lost'.
An explanation of this is that a user may have refreshed or clicked back in their browser or disconnected somehow before the request went through, although a number may have been allocated at this point. This should have been obvious to the end user and can be assumed, if intended they would have requested the digitisation again.
If you notice a request number is skipped in the sequence, it may be worth contacting the user who made requests around the missing request number to identify if they have had any difficulties.