Qwik Tune tuners are, generally, awful. They are slow to respond to the note and thus the player is turning and the tuner is searching for the missed note. It's EASY to mess up with one of those tuners. If the strings break at the bridge I'd look for a sharp saddle. If they break at the tuning peg my guess would be a poorly wound string that crossed itself on the peg and cut itself off.
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