WeBuilder 6.3.0.58
It is very common practise in css to leave the units off when the value is 0 - since 0 is 0, regardless of the units, so...
padding: 25px 0 25px 0;
means padding top 25px, right 0, bottom 25px, left 0
in WeBuilder inspector this shows as
Top 25px
Right 25px
bottom 0
left 0
The inspector is not much use if it can't be relied upon.