Axel doesn’t show some surfaces after loading IGES file. What could be wrong ?
Inspect the log file genereated during IGES import. Check if it contains information about ignored surfaces. If the ignored surfaces have ID 186 and are named as manifold solid, then you might be able to read them into Axel by re-exporting CAD file again with different options set. In your original CAD program try to export the part again but this time without using manifold solids. Normally IGES exporter will have an option on how to save solid CAD entities – they can either be saved as manifold solids or as separate surfaces. Choose separate surfaces.