Perhaps. If you made the model in Blender, did you Apply All (or at least apply the scale and location) before exporting?
As far as the floating object, did you place it on the ground in the editor, but it floats up when you run the game? If so, you may need to go to Advanced settings and check the IsImmoble box. If you can't see Advanced Settings on your right-side panel, go to Edit>Settings and, in the pop-up that appears, click the Developer tab (click Yes when it asks) and check the Display Developer Mode Object Features box toward the bottom). I'm just guessing here, though.
It would help if we had a screen shot to see what's happening. Even better, it would help if you had a model you could share that was doing this.
Intel i9-10900K 5.10GHz, 64 GB RAM, Nvidia GTX 1080 ti 11GB, Windows 10 64-bit, dual monitor display