Is this a freak occurrence?

NO! It is a very common occurrence. It is a well-known error. One person has had to file over 100 disputes for mistaken bird sounds. For some reason Google is reluctant to fix this so companies like rumblefish take advantage of it to gain fraudulent income (google makes something also).

Companies registering reference file with the CID are required to manually review any disputed video but rumblefish is one of many companies who just automatically confirm the content regardless of how ridiculous the match is.

Now then, when a dispute is filed advertisements are cancelled until the dispute is answered. There are advertisements on your video so before we go further I need to know the status of your dispute. Please post the notice found on your “Copyright Info” page. It might be something like “These content owners have reviewed your video and confirmed their claims to some or all of its content: Entity: rumblefish Content Type: Sound Recording”