What is this random buttocksing? Apparently, the word of three letters that means a donkey in English (and also is misused to mean something else in Americanised English) is not acknowledged as part of a proper word, and therefore, those words are getting changed into buttocks.
My suggestion is to add a space after the word for the autocorrect function, or if this is not possible, then add exceptions to the rule, where the word will not be autocorrected. The words are all forms of a..s..s..u..m..e, a..s..s..u..r..e, and probably a..s..s..o..c..i..a..t..e. All derivatives of these words should be allowed, or the sentence will look like this.
"I assume you assured the clients that we only associated their names with the necessary purposes."
![Rolling Eyes :roll:](./images/smilies/icon_rolleyes.gif)