Balls can also deteriorate... or 'wear out', and as I understand it, when one ball breaks down it is replaced immediately by another of the same type and kind. Perhaps you 'wore out' the first two and then lost the 3rd?
Just a possibility.
If you really want to know, send your question to members@worldgolftour.com and ask them directly.
Have a nice day!
(ps, I am so proud that I could answer a post like this and leave all the jokes about the title alone.)