If you are copying and pasting cells from Excel into Navigator - you need to ensure that you do either of the following:
1. If selecting the cell and then either right clicking to copy, or selecting ctrl C for Copy and then ctrl V for paste - you need to ensure that once you have copied the cell into Navigator that you select backspace. You will then see the text displaying in the field.
This is because when copying and pasting a cell from Excel, when you paste it elsewhere, it automatically drops down one line.
2. Best practice, is to double click on the cell within Excel until the text becomes highlighted - and then paste into Navigator. This will then display first time as you would expect.