Nothing happens randomly or uncalculated in maya. I dont know what your trying to do exactly, but if your using the soft mod tool you may want to reconsider. try something more specific like the translate tool.
why do you need the soft mod tool?
what type of modeling are you doing?
what surface type are you using?
<html><font size=2>
<font color="blue">
And after calming me down with some orange slices and some fetal spooning,
E.T. revealed to me his singular purpose.
--TOOL, 10,000 Days---
</font></pre>
</html>