Something is Wrong with the Title Tag!

I don’t know why, but all pages that I have on my website have the title tag “altered”, https://www.maindevice.com/tag/iphone-4s/, for example this one, if you look at the title tag you will see that it is Iphone4sMain Device | Main Device, putting the title name when it shouldn’t before |. it goess the same for all kind of pages on the website.

i use all in one plugin