Basically, after completing certain levels, on scrolling down the level select page, halfway down I discovered checks appearing on both the top and bottom set of dots (see attached picture below).
Firstly - V1.47n is not experimental anymore, it's been released as a stable version now! :)
Anyway, I know why this is happening and it should be a very easy fix; although it's minor enough that I'll leave it until the next update.
Fixed for the next update.