I have a feeling mine did the same at one time. “The Expanse” was the topic of discussion in a discord server I’m in for a while, and I’m sure at that point I was forced to add the capitalized version so my phone would allow it. Instead of creating a separate entry so that both the capitalized and lower-case versions would be permitted, it must have “learned” that the word should always be capitalized, which is a mind-numbingly ineffectual way to do things.

I’ve now added “expanse” to the dictionary, so let’s see: You should watch “The Expanse.”

It works now, both ways! I know there are other perfectly normal words in keeps insisting are wrong though, and I’ll only be able to fix them in the moment when I’m trying to express myself quickly. Oh, it used to capitalize “express” every time too because I once texted a friend from inside an Express store. Absolutely bonkers.