This bug is extremely similar to MCPE-31021.
The texture on top of Iron Bars is offset by an amount of space which is slightly less than a single pixel.
Glass panes do not appear to have this offset, which allows for an easy way to see the difference.
Linked issues
duplicates 1
Attachments
Comments 5
Duplicate of MCPE-31752. This is now known to affect many blocks.
Confimed on W10 and Pe 1.2.10.2
Some textures are slightly offset such as glass, iron bars and other.