"Tipped" Rose Buds

I have 14 roses in my garden -- 7 in front of my house and 7 in back -- each a different variety. Most seem to grow and flower well.
'Pink Perfume", however, has a problem. As its flower buds mature and start to open, they tip over until they are at right angles to their stems. Then the flowers are misshapen. This does not affect the adjacent 'Brandy' or 'Honor', just about 3 feet away on either side.
Does anyone know why this happens and how I might correct this?
--
David E. Ross

While many tributes to the late Supreme Court Associate Justice
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David E. Ross wrote:

have you checked for borers? or is it root bound? or is there a problem with the water supply to that plant? those are what i would check.
songbird
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On Thu, 31 Mar 2016 14:21:07 -0700, "David E. Ross"

http://cues.cfans.umn.edu/old/extpubs/6953rosepests/6953_03.html
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