Q.Roses Growing From Beneath Soil
Garden designer dug up (or did he?) 5 rose bushes – my history with roses not good. They have all grown back from beneath the ground 1 from beneath gravel and have flowered, some better than others for 7 years . Most are not a thing of beauty and very very thorny. Are these all suckers? I’ll probably dig most up if they are .

Certified GKH Gardening Expert
It sounds like the roses were probably grafted and what grew back was the rootstock of the rose, not the desirable upper part. Replacing them would be your best bet.
https://www.gardeningknowhow.com/ornamental/flowers/roses/own-root-roses-grafted-roses.htm
https://www.gardeningknowhow.com/ornamental/flowers/roses/removing-rose-suckers.htm