Don't let that disappoint you - I've seen plants have a split synsepal one flowering, then fused at other times.
I have a parvi/multifloral hybrid that has bloomed deformed for the last 5 years. I intend to throw it away, but always end up waiting "just one more flowering...." It opened a blossom about a month ago - same result, so i set it near the door of the greenhouse so I'd remember to pitch it. Wouldn't you know a second bud opened that was perfect!
I think the plants do that crap intentionally, just to get our goats.