I bought a Storm ball a long time ago that had a bad weight block. Storm replaced the ball with a new one after I sent the wonky ball back and they tested it.
My Mom had a bad Ebonite Vortex V2 Pearl years ago. The weight block was all out of whack and the ball wouldn't move a board. We tried changing finger weight, side weight, surfaces, etc. Ball always went straight regardless.
I had a Brunswick Danger Zone D2Z that I purchased via mail order when they first came out (before the proliferation of online retailers.) When the pro shop put it on the scale, they determined the CG was mismarked and was way off of the factory mark. They marked the proper CG location and drilled accordingly. Ball worked perfectly.
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