Importing mesh into Roblox creates unwanted extra flat part

[HY0513 (hyc040513)]

Whenever I import the mesh from Blender there is a flat part that sticks out that is not supposed to be there.

I really don’t know how to explain this issue so searching devforum and Google isn’t helping right now… Any help will be appreciated!

What it looks like in Blender

What it looks like within Roblox studio

[Gucci_Dabs222 (Euphorian)]

Try turning off double-sided. If the issue isn’t with the mesh itself, it must be in studio.

[GamEditoPro]

1. Apply all transforms
2. Recalculate normals
3. Import to roblox

[HY0513 (hyc040513)]

It’s the issue with the mesh itself, I triangulated it and now it works perfectly! Thank’s for help though!