Pages autocorrects correctly spelled words
I do a lot of writing on Pages and am finding that it autocorrects words that are not misspelled. What's worse, it'll take a correctly spelled word and change it to an incorrect, non-word. For example, I just typed the word "including" in one of my Pages documents, and it 'autocorrected' it to "includeng". Though there was no red underline when I first typed the word (correctly), it changed it to an incorrect spelling and then red underlined it. This happens extremely frequently and is quite aggravating as I am typing long documents.
MacBook Pro, OS X Yosemite (10.10.5)