unreal engine 4.7.2 snap objects to grid is not working can anyone help?

Hello I am currently using unreal engine 4.7.2 and for some reason whenever I want to snap objects(BSP) to grid by pressing ctrl+End it will either stay in the same position or collapse a tab called surface materials that only appears when I select the object. Can anyone offer their assistance?

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Hi!

Snap to “floor” is always be key “End” without Ctrl. Alt+End - snap Pivot of object to floor.

Hello thank you for the advice I have tried the end key as suggested but for some reason nothing is happening. Any suggestions on what might be wrong, maybe on my part? Thank you for your time & assistance by the way.