I'm an experienced VHDL designer, but sometimes I have questions, too.
Many of my questions in the topic of VHDL receive a -1 downvote right after posting them on SO. There was never a comment stating any dislike, off-topic notice, silliness, or what ever. I suspect that I get these downvotes in the review process, because it's mostly within several minutes after asking the question. As I have enough reputation to see close votes, there is no pending close vote for my question.
Here is my newest question, which received a downvote.
Yes, in this case I found the answer by myself, but this questions documents a strange behavior/bug in a commonly used software.
How to deal with it? Is it always the same user voting me down?