Same thing is happening to me.
This is a problem in alpha build 2.
this happens to me to I noticed it depends on what is in the hot bar.
This is not resolved it is still a problem for me with version 0.8.1 you can still duplicate items
This affects version 0.8.0 Alpha build 7
This issue still occurs in beta build 6
EDIT: Now that Alpha build 7 is out it still occurs in this version.
My track is 50 blocks high and it only makes it up 23 blocks and then it stops and goes back to the bottom.
(My device is a Samsung Galaxy S4)
I'm pretty sure you have to have enough wool for the color of carpet you want to make and then the recipe will appear.
Well at least as fast as pc
Is this being fixed
The same goes for snow balls if you throw them when you have joined a game it will crash
Also when this happens you loose your armor
Please fix this issue
Fences won't burn in 0.7.0
update to my post people can join my server now but when they join and click on a chest or something their game will crash and will have to get back into the game
The same problem is happening in my world