Hi QC99.tsilvius...
This is just a guess...but when you initially check the box for "Use this rubric for assignment grading" before you've actually added a rubric to the assignment, and then you search for a rubric that was already built to add to the assignment, you need to re-check the option to "Use this rubric for assignment grading". The first time you do it...technically there isn't a rubric there, so "this rubric" wouldn't apply. But, after you've added at least one row of criterion to your rubric (or searched like you did), then you'd be able to go back to edit (pencil icon) the rubric to check that box.
I tested this out in my own sandbox course, and I followed your steps. But, after I searched and added a rubric the way you did, I had to go back to select that check-box. The points would fill in when using the SpeedGrader...so you don't have to manually type in 19 (out of 20).
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