I have had this problem about three times when playing the shoppa scheme. It seems that there is a chance that the crate will appear just where a worm is standing on, making it automatically get the crate. Dunno if it was posted already, but I'm sorry if it already was. BTW, I'm using the latest update.

Can you post a replay for us. (Stored in the \User\Games folder if you're not sure)

You're probably playing with the /teststuff command enabled. This is a known bug.

Your solution is to disable that feature, since it's only there for testing purposes.

Yes, worms that are hanging from the rope during other people's turns due to the batty ropes feature enabled with /batty or /test are not yet recognized by the crate algorithm.

But these are unsupported test features anyway, so turn them off if you don't like it.

...crate will appear just where a worm is standing on... This shouldn't happen if the worm is standing on something, only if its dangling from a rope.