shadow appearing on both sides?!? can anyone help please?

pocoster

Basically what it says in the title a few of my pillars are producing the same shadow on both sides. The shadows are being generated by a skeletal mesh (the fan you can see) and it has happened on a duplicated version in another room. Ive looked at the light map for the pillar and its fine so i can only think that is is the object itself but if anyone could shed some light on how to fix this id greatly appreciate it.

Oniram

can we see the uvs and lightmap of the object? thats honestly the only thing that i think would cause that issue.