It baffled me too, but people have legit complained about this stuff to her and she's had to explain to them that I just talk like that. She has no expectation of me to change at all because she already understands my intentions perfectly well, but she told me simply because she felt I should know people were complaining.
As far as the period thing, apparently it's the last sentence I'm supposed to leave punctuation off of. I don't get it tbh. I mostly talk to people in MMOs and over Discord and apparently when I add a period to the end of the last sentence it makes people feel like I'm trying to end the conversation. It makes sense to me that people think that, given that every time I did it they'd just stop talking, but why they think that is a mystery to me. She said she thinks it's because they're just not used to it.