I downloaded the Lending History, but it does not show anything strange. Only the loans that ended regularly and generated the remaining BTC in balance.
Either somehow the those BTC are still active loans, but not showing or did I just loose 30% of those coins because a number of lenders not able to repay?
Anybody else experienced this or is something else happening?
Did you contact Poloniex? Because this shouldn't happen.
Before someone is unable to repay you, there should be an automatic forced liquidation, so that your funds are save. Maybe a glitch due to very high demand?