Swing trading has its peculiar risks, and FTMO knows this so they created the FTMO swing account to address these risks. An example of swing trading risk is when you open a trade and leave it open over the weekend and b th time you check on Monday, the price has gapped upwards/downwards. Such a gap can throw you into multiple pips of profit or multiple pips of loss.
The gap could be caused by news events that are priced into the market when it opens the next day. Because of this, FTMO lowered the leverage on the swing account so that you cannot open very big positions when swing trading and this is a form of risk management not only for you but also for FTMO. They need to protect their bottom line