Maybe that was the case here:
If you're from Europe and using a European (ESMA) regulated broker (like with Cysec, BaFin, ICB regulations) it is possible that all your trades will have a maximum SL of -50% and also a maximum leverage of 1:30 in your broker's account. Maybe you've been stopped out at a 50% DD?
P.S.: If you don't want to have a maximum SL and/or a higher leverage usually you just need to register a professional account with a broker within the EU (but it's very hard to get one). Otherwise you can still register an account with an offshore regulated broker (like with IFSC, FSC, FCA (note: ASIC (and in some cases also FCA) officially are not accepting 'out of scope'-traders anymore (for example from the EU)).