What applications are you using to do the comparisions? If they are NOT ICC aware (like LR or Photoshop) it's not unusual they don't match. You need to be aware that with ICC aware applications, the display profile AND the document color space are both used to produce a preview. In non ICC aware applications, the display profile isn't used a lick and the numbers are sent directly to the display. So even though you have an sRGB file, one application knows this and uses the display profile to produce a preview. The other isn't. And so they don't match.