Bug Canvas automatically scaling, not reflecting game view + texts disappearing

Hi,
I'm pleased to say the Linux Editor is very functional and wanna thank you guys for making it happen.
However, I'm facing some weird bugs related to UI editing.
- The canvas in the scene view keeps automatically changing its size to 3 times the reference resolution, so the UI doesn't look like the actual result in the game view. When I go to the game view and select some resolution, and go back to the scene view, it gets corrected, but as soon as I try to edit anything inside the canvas, it happens again...
- The text elements sometimes arbitrarily disappear (for example when I change the resolution in the game, or even when I open another window in front of the Unity editor and go back to it).
I'm using Linux Mint 19 ("Tara"), and have attached some screenshots to clarify the issue.
Thanks!