Hmm, it's possible you got logged out while editing and when you saved it got posted as a guest build? Unfortunately if you don't know what the URL was for the build I can't do much to help you :( You could try going to the browse builds section, increasing the filter to allow guest builds, and look for it in that list based on the date you published it. If you find it let me know and I can help you from there.
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Please help :)