When I looked at the listing it shows this is a once bloomer.
How are you pruning this rose? Old Garden Roses can be picky about how they are pruned. I'd contact your local Rose Society and see if a consulting rosarian would be available to look at the rose with you. They would be able to determine if it is the plant or something you are doing.

You probably already know a rose's performance depends so much on where it is planted and how it is cared for in general. Many roses will spend their first year, even years, developing a good root system before it puts any energy into blooming.

Wendy C's comment about pruning ogrs is right on target. Some roses will only bloom on old wood. If you have removed that wood when you have done your annual prunning, you won't have a rose that will bloom very well. Other roses bloom on both old and new wood. Since I haven't grown this rose, I cannot tell you the best way to prune it. Maybe someone else who has grown the rose can jump in here and give you a definite answer.

Smiles,

Lyn
helpmefind.com