Volkswagen Golf automatic

Volkswagen Golf automatic 175000km nct not long out it’s 1.4 tsi this car when up to cork gearbox centre put a new clutch and Medtronic unit into the car because it was not changing gears right and then he put a reconditioned gearbox in it and it’s driving fine but what it started doing now is it jumps in first gear and change all the rest of the gears fine I don’t know is it a software issue or something stupid like wrong oil in the gearbox because them boys in cork gearbox centre are stupid I’m sick of car so sold to the trade or someone that knows these cars like I said once it changes to second gear drives fine in all the rest of the gears you can see the new reconditioned gearbox in the car when u look under the car