Problems with physics asset

I’m trying to import a skeletal mesh from Blender.
The physics asset it generates is wrong. Here’s a picture of how it looks:

I tried readjusting the values as the minimum bone size and other random stuff without success.
Also, I can’t edit it manually. When I try to move a sphere it just goes away so fast and its impossible to work with.
What can be causing this? Any suggestion on how to fix it?

Thank you.

Here’s the last setup I tried:
Blender exporter:

I also tried different combinations of scale. (Scaling the model, changing the scale in the importer, not changing scale at all… the result always is the same (in different scale))

UE importer:

I finally found a video which explains my problem and gives some advices. The video was post by Geodav in this post:

Link to the video:

Thanks to Geodav!

(The key was apply the transformations. In Blender → Select objects to import (In object mode) → Ctrl+a → Rotation and scale)