Why did my roses bloom like this?

[C00KiE46]

A few roses bloomed like this. They had brown on the petals. What caused this?
[img]https://i203.photobucket.com/albums/aa241/M0MMiE_album/IMG_3598.jpg[/img]

Others look like their doing better and did not have any brown in the petals.
[img]https://i203.photobucket.com/albums/aa241/M0MMiE_album/IMG_3599.jpg[/img]

[C00KiE46]

Thanks for the info. I was getting worried at first. Glad to know they will recover.