I figured out the problem. The catch-up tool automatically sets what chapter you are on based on where you end. I watched through the chapter one choices, so it set me on chapter 2 and didn't let me enter any later chapters. When I watched through chapter 18, it let me go to chapter 18 and no later chapters.
I have completed up through all the chapters thru 21, but I just came back to find my progress all gone. It's the same account I normally use in the same browser I normally use and I didn't even clear cookies or history, but now the game wants me to play through all the chapters again to unlock chapter 22. Is there a way to circumvent this or do I have to play through all the chapters again?
My game glitched out after I picked up the train. I tried to move the crane backwards but the top half of the crane stayed, while the bottom part moved. Please plus this so the developer can see
 "Exit/Corners"){kind=icon}
 "Snailiad"){kind=icon}
 "Little Wheel"){kind=icon}
Oh, dang, I must have switched a value to be lower by accident. Thanks!