Why don't upvotes to questions show in the scores in the appropriate tag on the user page, the tags tab? Only upvotes to answer do.
I think you misunderstood something; tags on any SE site only show the vote count for answers.
If you mouse-over the number you'll also get the question up-vote count, but for tag badge purposes only answer votes count.
For example, here's my (measly) SuperUser tag count for one tag; note that I have 4 upvotes for my question with the