I'm going to address what I feel is the elephant in the room here, because none of the other answers have really mentioned it yet. Note that this answer is based on the wording of the question. I may be misinterpreting this wording, this is my conclusion based on word choice and sentence structure.
Finding bugs is fine, because that's what you're paid for.
However, I think the real problem here is not that you find so many bugs, but that finding those bugs has given you a certain boost to your ego. From reading your word choices ("excellent work", "threat to other's job security", "I'm revealing their mistakes",...), I get a certain impression of you. I get an impression that you think you are much better than your coworkers, both in the testing department and in the development department. And because you think you are better, you act like you are better, both towards us and your coworkers.
Whether or not you actually ARE better is besides the point. The point is that your coworkers dislike you because you appear to be flaunting your findings in their faces and not showing a measure of humility. This is not a "I am too good at my job" problem, this is a "I'm too big for my boots" problem. As long as you are acting like you are the only competent person at your job, your coworkers will not like you. People who act like that are often one of the first to be targeted during reorganisations because they have a big impact on coworker morale and productivity.
Again, finding a lot of bugs is fine and should be encouraged. Acting like you're amazing because you find so many bugs and rubbing it in the faces of your coworkers is NOT fine and should not happen.