After upgrading my project to 2017.3f3 I've stumbled upon a weird animator rotation issue. As the video shows, when I rotate the object using the axis, the Z rotation go to abnormally huge values. This issue does not happen when I translate or scale the object. If I set the value manually on the animation window, the bug does not happen, but if I set the rotation value on the inspector, the bug still happens. I've tested on a new project and the issue did not happen, I've tried to reimport all assets and downgrade to 2017.3.0f2 and 2017.2.0f3, I've also tried to change the rotation from Euler to Quaternion on the animation window, but none of it worked. I'm not sure if I'm missing something or it's a legit bug specifically in my project. Any help will be grealy appreciated, this is causing a major delay in my game development. [EDIT] Some more info: Since I use unity collab, I redownloaded the whole project in a new folder, started a new animation and it seemed to solve the problem. However, as soon as I closed and opened unity again, the issue came back. Also, I noticed if I type some specific angles, it won't bug. For example: angle 1 bugs, angle 2 does not, angle 3, 4, 5 and 6 bugs, but 7 does not, and so goes on randomly. I'm gonna send a bug report, this is is really annoying and time wasting trying to solve.