Problems with shapefiles in snap

Hi, i want to import a shapefile to snap wich has 13 differents polygons but when i do, snap say me that the vector data sets contains only 3 polygonal shapes. I dont know why happened this, someone knows about it? I reviewed the shapes in QGIS and seems to be ok

SNAP is quite sensitive to invalid geometries. Run the fix geometries tool in QGIS, there might be topological errors which are not visible.

The fact that only some polygons were imported underlines this indication, I had a similar case once.


Thanks!! I did and yes, i had a few little errors! Now recognize 13 polygons