Cattle moving a gate in the corral

This morning I found a gate moved a distance in the corral.   This is the second time the cattle moved this gate.   The first time a few days ago the gate was moved to another location in the corral.  How the cattle can move this gate is a mystery.

The red arrow shows where the gate was before.  I had it leaning against the fence there.  I never got around to putting the gate outside the corral when I no longer needed it in the corral. This morning I put the gate outside the corral.

The blue arrow points to a couple of plastic salt lick buckets.  They are now empty.  I had them stacked where the blue arrow points to the right.  To the left you can barely see the buckets.  I guess the cattle got bored and decided to push the buckets around the corral.  Kind-of like the recent video of the bull and the large ball.