Great but with glitches

I absolutely love this app - I am a big fan of highlighting and typing on notes, and I love that it syncs with my iPad. However, there are some serious glitches that I’d like to see resolved in subsequent versions:
1) For some reason, everytime I type “didn’t” it autocorrects to “did’t” (which doesn’t happen on any of my other applications) and then everything I type afterwards disappears. Additionally, unless I “cut” the textbox and restart the app, a small black square (about 1inx1in) appears on certain pages of notes and can only be moved by quitting the application again and again - as well as this, I sometimes see text that I’ve written earlier showing up in later parts of the document, but only small portions of it which cannot be moved at all.
2) It seems to be impossible to copy and paste any content, ever
3) when I click on the top grey bar to try and move the window, it moves, but it also scrolls up my notes very quickly… incredibly frustrating.
4) finally, scrolling through large PDFs can be an issue on the mac - sometimes it is a very slow and glitchy process, particularly if you are hoping to scroll through multiple pages.
It would be nice to see some of these very odd glitches resolved in subsequent updates, particularly at the price we are paying relative to other notetaking apps. That being said, I am a very devoted fan of this app either way - even with its glitches I think it is a great app and certainly a worthwhile purchase for myself as a university student. Additionally, it would be nice if notes could be organized within a single subject (as others have suggested) - for some reason, it is impossible to simply drag notes to the top or bottom and sub-folders within different topics are not available - this is quite frustrating.

Lindsay11111 about Notability, v2.0.0