Photoshop Vanishing Point doesn't paste into blue grid correctly

[BLTV]

When I copy and paste an object into the VP blue grid, it extends past the grid bounding boxes. When I reposition or resize the object, the grid doesn't confine the object to its boundaries.

 

[Peru Bob]

I've moved this from the Using the Community forum (which is the forum for issues using the forums) to the Photoshop forum so that proper help can be offered.