FOSS gamedev and creative worlds

Ok well i built a water fall and rode a boat down it.The boat went fling in air and just keeps going up here are some screenshots.









These are not in correct order.

You-re using 0.4.10 stable? this was fixed recently, download latest minetest game and move it to your 'games' folder.

I experienced a similar issue, But when I closed then reopened the game it stoped.