There is a bug with wood slab. I put it and it's in the air
Linked issues
is duplicated by 7
MCPE-1450
Mining a upside placed slab gives you the up placing slab with red background.
Resolved
MCPE-1243
wierd half slabs
Resolved
MCPE-1304
Red box glitch
Resolved
MCPE-1360
Slab glitch
Resolved
MCPE-1397
Wooden slabs have a red background in survival, and are labeled "stone slabs". Requires a pick to get back.
Resolved
2 more links
This happens with all slabs