Price has two fields
Starting range = Start value
Ending range = End value

When user do not enter the starting range or start value, it will not work well

Both fields need to be added for it to work

This mean you need to specify
Start value = 0 and cannot leave it as From

Can we make "From" = "0" because not all users have the habit of entering 0

They will just key in the upper value as they are looking for someone not more than USD1,000