spelling suggestions

Why is the spelling suggestion feature always trying to correct what I type ?

and conversely...I make typing mistakes, as in this question box where I have inadvertently hit the NRP when trying to use the come on you can say it two words space bar. Wow I didn’t think it was ever typed those two words.

So in an email I was trying to type the word Gilligan, and wanted to keep putting in the word Gilliam. Obviously here you can tell the difference, so Why couldn’t it in the email?

The other thing it does if I miss type of word and hit the it will keep the miss type a word in there even after I correct the word. I am obviously attempting to use the speech to text feature which you can see is struggling a little bit.