SAMSUNG GALAXY S4 v4.3 JELLY BEAN

Placed a sign on the ground (stemmed.) Proceeded to then place more signs around the original sign and on top of the sign.

What I expected to happen was...:
Not be able to place a sign on top or side of another sign.

What actually happened was...:
Placed signs on the sides and top.

Steps to Reproduce:
1. Place a sign.
2. Click on the sides and top to add signs to signs.
3. N/A

If this is intentional, it should not be.