Hey! Thank you for the feedback!
So, the save screen is set up to appear on a right click. With no great insight into how this appears to you, I am going to assume that somehow, the game thinks that you are right clicking. It does, however, seem like you've tried a couple of different controls, so I'm not sure how well the theory holds up. Is there any way that your computer might somehow register unintended right clicks?
The Renga error: Yes, you're right, thanks for noticing! I've fixed this in my dev version and will roll out a new version once the game has seen a little more play :)