Did you try adding an absurd amount of hops to the recipe to see if it's simply that the amounts are very low? You can see the hop IBUs framed within the style on the comparison bars.
There are several places to adjust how IBUs get calculated.
In Options > Bitterness, make sure that the calculation is the one you want. Tinseth is the most often used.
Within the equipment profile, make sure the "Large Batch Hop Util" is set to 100.
Each hop use can be set for boil, Steep/WP. If you saved some as Dry Hop, then they will always contribute zero IBUs. At the same time, make sure the hops have some boil time assigned to them.