Sigil is *never* going to create a style by itself called "IGotHired". It is in your original document somewhere. Also Sigil in Pretty Print or "Off" modes for Clean Source will not be removing <i> tags - in "Tidy" mode it can indeed fiddle with your html but as others have said that will result in .sgc-# numbered styles appearing inline, never anything else.
And if you are having problems saving, most likely it means you are having the document open in another application that is taking a write lock on the file. Verify that you don't have the same file open in another application. If that is not the case, then it sounds like you have some sort of disk issue or perhaps an AV conflict of some kind.