to move at a constant speed, don't use the object's current location as one of the lerp parameters.
and you will need a variable to keep track of how far it has moved (from 0 to 100%)
so, if you have an object ShopP1, and want to move if from 200 to 0 in one second you would use:
Global number PercentDone = 0
PercentDone < 1
- System Add dt to PercentDone
- ShopP1 set X to lerp(200,0,PercentDone)