Incremental drop-down weight locks into place at top of repetition on lat pulldown ma

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Does anyone else have this problem, where the optima series lat pulldown at planet fitness, the incremental drop-down weight locks into place at the top of the rep, so that when the weights come down, the incremental drop-down weight stays on top, and you are forced to do the rest of the set at a lighter weight than you wanted to. How can this problem be fixed?