why is it when i shift a document from an email to word editor and then to email the fonts changes?

Question

no idea how this happens

Answer 1

Word hates you. It hates us all. It is an inferior product which has not been improved due to Microsoft's monopoly.

Text formatting is the biggest black box in MS's software and it has taken years off my life.

There is no answer to your question. Get out while there is still time.