When you trade leveraged CFDs, you can invest more money than you have in your account, but your losses will increase accordingly. If you trade with leverage, then the face value of your trading position will be more than the amount in your trading account. Therefore, if the market moves significantly against your trades, it could turn your account balance negative.
For PGM, the margin call level is 100% and the stop out level is 50%. This means that as soon as the margin level drops to 100%, you will see a margin call, which is: instructions to take appropriate steps to reduce your risk exposure or further top up your account. If the margin level drops further to or below 50%, the system will automatically start closing the position, bringing the margin level back to a reasonable level.