The harvest calls calcCurrentReward which computes _secondsSinceClaim = block.timestamp - mapMemberSynth_lastTime[member][synth];.  As one can claim different synths than the synths that they deposited, mapMemberSynth_lastTime[member][synth] might still be uninitialized and the _secondsSinceClaim becomes the current block timestamp.
The larger the _secondsSinceClaim the larger the rewards.
This bug allows claiming a huge chunk of the rewards.
Recommend letting users only harvest synths that they deposited.
strictly-scarce (vader) confirmed:
strictly-scarce (vader) commented:
