A photo would really help here, but it sounds to me like the mount is too small. Root attachment gives the plant mechanical stability and "security", if you will. A well-established (i.e., stuck to the mount at a lot of places) plant will grow and bloom better than one that isn't.
If the plant's is barely attached, remove it and put it on a bigger mount. If it is wrapped around the mount pretty well, find a way to permanently attach it it a larger mount, as-is.
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