For anyone else that was confused, apparently there is an alternate usage of the word 'Cleave' that means 'to adhere' (rather than 'to cut' or 'to separate').[0]
I hadn't heard of that one.
[0] https://www.dailywritingtips.com/75-contronyms-words-with-co...
[1] https://www.merriam-webster.com/dictionary/cleave#:~:text=De...