The ingots fall into the grooves of the rollers as they are supposed to because the cutter is timed with the rollers by chain or gears depending on the machine, but when they are super hot and if the ingots are oversized and/or the rollers are grabby or slightly mis-aligned, they can jump and hop in the grooves a little and if one jumps next to another and they happen to touch at all, they stick together immediately with the gummy hot glass and get sucked into one groove or the other. Sometimes they flop around and grab up all the other ingots next to them and you get a messy glob of marbles that the operator will grab with the tongs and pull off. But sometimes the operator is lighting a cigarette or something and a few get by. I've witnessed this at Dave's.