When we import data into Budgyt, we switch the sign on Revenues, and import Expenses as they are. This is because when we look at your data we subtract your credit amount from your debit amount, so revenues will appear as negative numbers.
If it looks like sections of your data have imported with the wrong sign, it may be that you defined Revenue categories as Expenses or vice versa. You can check this by going to Settings > Manage Categories and looking at the Type column in the middle.
If your categories all look ok, then it may be that you imported everything as a positive number. Revenues should be imported as negative numbers.