I am almost certain the red and/or white rolled off.
Have you ever tried replacing the cue-ball to a position where it was touching another ball? It is sometimes very difficult to replace them so that they are touching; it is even sometimes necessary to move the object ball a smidgen because the touching scenario is not possible to attain. (Probably because the cue may have been struck downwards creating a bigger divot in the cloth which the white will then sit in when replaced.)
Have you ever tried replacing the cue-ball to a position where it was touching another ball? It is sometimes very difficult to replace them so that they are touching; it is even sometimes necessary to move the object ball a smidgen because the touching scenario is not possible to attain. (Probably because the cue may have been struck downwards creating a bigger divot in the cloth which the white will then sit in when replaced.)
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