Each mobile app will pre-allocate 25 odd numbers whether it's quote numbers, job numbers, or invoice numbers. This ensures that a mobile app user can create a quote, job, or invoice without mobile coverage as Ascora supports offline mode.
You will see a jump in numbers, as expected behaviour, to guarantee unique quote, job, or invoice numbers can be allocated.
You might also see a big gap when mobile apps are being deleted and reinstalled multiple times.