Version of Opera is different than the official release.
When I was updating the browser, I noticed that my version is different from official one. Current release is 45.0.2552.898 and my version is 126.96.36.199225572 (PGO) and the UA string contains "OPR/188.8.131.52225572 (Edition EXP136.2)" identifier. Can anyone tell me why I've got different browser than other Opera users?
Sometimes they release what they call A/B versions, which are used for testing something. Sometimes the difference isn't noticeable to the user (unless he checks the version number as you did); sometimes it is more obvious. Unless they tell us, we won't know what they are testing.
Ok, that makes sense. I was worrying if I was hacked or something Thanks!