Might be because of my ugly parents :/ (as stated in a previous Duo-Lesson)
Your ugly peasant parents who don't like it when your neighbor-friend eats ants?
So the TTS is carrying the hard g sound from Jag to är, is that actually a thing? Is it like liaison in French?
No, Swedish doesn't have liaison. The G in "jag" is silent in all but very emphasized use, as is also the R in "är". But the TTS doesn't get everything perfect, with being a non-human and all that.
I don't understand, 'perfekt' is written here in the -ett form, but refers to 'Jag'.
It might be because generally in Swedish you use the -ett form referring to people and the -en form referring to things.
Not true. For perfekt, there are only two forms, perfekt and perfekta. So perfekt is both the ett and en form of the word. We use the ett or en forms for both people and things depending on the gender of the object, but of course most words for people are en words.
Why is it perfekt? The adjectives is after the noun.....so adjective should keep its basic form