Ergonomic mouse why is it clicking so fast?

I have an Ortho mouse that the clicker is sporadic, it opens sites automatically, and when I go to e-mail, I click on an e-mail address and the clicker is so fast it opens and closes immediately....I have to keep clicking til it catches......The cursor moves ok tho.......I went to my mouse setting and put it on slow and I went to keyboard and put the cursor blink rate on low, but to no avail? any suggestions would be helpful, I paid allot for this ergo mouse for my carpal tunnel and I really cant afford another!