Linear gradients aren’t really a “seems to” thing. You’ll save yourself a lot of time once you have some understanding beyond guessing at what does what.
As long as the number is less than the finishing number of the section before then you get a perfect colour stop. So if the previous colour finishes at 86px then the next one can start at 86px or less - even zero.
If a color stop or color hint has a position that is less than the specified position of any color stop or color hint before it in the list, set its position to be equal to the largest specified position of any color stop or color hint before it.