I enjoy a rose call guinee. lone small white flowers this year.? this rose had a beautiful open red rose the first year, nothing...

this rose had a beautiful open red rose the first year, nothing last year and these flowers which look resembling hedgerow roses this year. what's wrong?
List 2 ways a plant can cross-pollinate?
Answers:    It's reverted.
Cultivated roses are usually grafted onto a briar root stock. You have to take heed not to let it grow from the base or the briar will pinch over.
Have a good look at it and see if there's anything left of the cultivated rose - it will enjoy bigger leaves. If there is, cut off everything else right fund to the main stem - or if it's growing out of the ground, back to the most important root. If there isn't, dig it up and use it for hedging.