@IvaR welcome back 
It is difficult to say what is going on in your workflow. I think you would have to provide us with an example representing your specific challenge (without giving away sensitive information of course) since I provided several working examples that demonstrate how to import data from Excel in various settings. If your scenario was not covered we would have to take a closer look.
Often it has to do with the correct ‘wiring’ of loops. If you want to educate yourself further on that topic I created a small collection about that: