UPDATE: I found the solution! You need to delete the X-Bones and create new one's with the SemiStandartBone Plugin.
1.Delete the x-bones
2.Go to Edit--->Plug-in---> User--->SemiStandartBone---> Dat thing where PMX is written behind
3. Uncheck グルーブボーン and click ok, a window will pop up saying everything is done, just confirmby clicking the button below and everything should be fine now
You can check on Transform View