1. first one is not a bug, but a comment. In the lobby, autobuy and autolevel are badly placed. If you have a custom build for arena and need to change your items or sell a starter- you disable autobuy. When back to lobby for next game, you can't see it as you used to - immediately. you need to click the button, so it's easy to forget.
2. now this is an actual bug. when autobuy is disabled and autolevel enabled, and you switch the autobuy to enabled, then when you leave the window, it secretly disables the autolevel. you can see it only when you're back to selection.