@Leonardo I’m just able to guess a little bit, because there are several reasons possible.
You wrote, you have exported it from one project to load it to another…
If you try to import the exported cases (just to this point of course) to the same project, do you see the fields? Probably the fields are not available in this project. Have you checked this (yeah, sorry for this silly point).?
Expecte result exists twice, one for separated steps and another for the simple version.
Are the fields probably already mapped (out of the image above)?
They will be removed from selection if already mapped.
One point in addition: If you’ve exported cases with separated steps, you shouldn’t expect to get them imported in this way. The export aggregates everythin to one row.
Just a try…