Every slab you see there is a painted cobblestone slab with Reinforced Undead Planks.

Reinforced Undead Planks: https://i.imgur.com/D3HIU72.png
Painted Slabs: https://i.imgur.com/g11d59w.png

Every time I teleport, the slabs go "low".

Bug before: https://i.imgur.com/z4Ci8ki.jpg
Bug after: https://i.imgur.com/rVpDLni.jpg

I have to right-click every slab to correct them.

Affected Versions (Do not use "latest"):

• EnderIO: EnderIO-1.10.2-3.0.1.107_beta.jar
• EnderCore: EnderCore-1.10.2-0.4.1.55-beta.jar
• Minecraft: 1.10.2
• Forge: 1.10.2-forge1.10.2-12.18.1.2089

Have the same problem.

http://imgur.com/a/IZ1BA

In single player exit and relog to reproduce.

Tested with:

• EnderIO-1.10.2-3.0.1.120_beta.jar
• EnderCore-1.10.2-0.4.1.56-beta.jar
• Forge 1.10.2-forge1.10.2-12.18.1.2113

Which mod adds the right-click-ability to slabs?

O_o This is with only EnderIO installed but that sounds like a neat feature.