It is probably not that much because of the replanting, but for some reason (contrary to what often is said) I never found old garden roses easy to grow. Most of the old garden roses I have tried to grow (30-40 different ones) do not do well on my rich heavy farmland clay, or at least they do quite worse than modern hybrid teas or shrubs or even old good wichuranas/musks as an example. My theory about that, mostly based on the experience with the other plants, is that the closer plant is to the species, the more likely it is to have a difficulty to adapt to the different soil/growing conditions (acid ground plants are the worst offenders there). Around the same time I had some same old roses planted in my old z5 foresty soil garden and here - despite the freezes and all, those in z5 are doing better. Also some of mine moved to Jays garden on more light soil and there they do much better than they ever did here on the clay.
So all in all, even though here Tour is struggling, it might do much better if the soil was more light and old rose friendly.