Thanks for the file. The problem is that the model consists of 6 meshes. You need to merge those separate curved side pieces into the main model to make a single mesh.
Here's a close up of the meshes, you can see that the triangles that make up the curved side piece are not integrated into the main mesh.
And here's Cura's display with one of the sub-meshes highlighted.
You should install the Cura Mesh Tools plugin from the marketplace to get the ability to check meshes and split them.
Unfortunately, I don't know if Cura can merge these non-overlapping meshes so it would be best if you did that before loading the model into Cura.
Hello @gwarokk, it would help greatly if you could provide the project file. Please do File->Save and attach the resulting .3mf file to this thread. Thanks.
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