Edit Google Sheets Scripts

Job ID: 32055329

Budget: £10 – £20 GBP

Fixing the code in this formula/script

https://docs.google.com/spreadsheets/d/19HNBigL4DghaariQ7uwXjIeufGsp2Gb5rUCf7s4JuJ4/edit?usp=sharing

there is a script running on this google sheet that calculates 3 columns, mileage, driving time and URL of the journey - the problem is this, every time there is a new row entry in the sheet the script unnecessarily recalculates all the previous calculations, the problem with this is that
1) it doesn't need to be done
2) there is an allowance every month that gets used up with unnecessary calculations so no more can be completed

I need all previous calculations to remain calculated unless there is a change in that individual cell and to keep the rest as it is
Related categories: PHP Excel Software Architecture Google Sheets