As @Clint said above, since you had three mini lot (10K) trades open, the total notional value of your open positions was 30K. With 1K in your account, your effective leverage was 30:1.
When you doubled your trade size, your effective leverage doubled to 60:1 and perhaps even more if the market price continued to move against your open positions thereby reducing your account balance. This approach is similar to a gambler betting double-or-nothing each time he loses. It works until it doesn’t. It stops working when your losing streak outlasts your capital. When it stops working you are left with a devastating loss from which it is difficult to recover.
The key point to take away is that when people refer to 200:1 or 50:1, they are most likely referring to the maximum leverage available to you. More important is your effective leverage. That is the ratio between the notional value of your open positions and the actual money you have in your trading account.
The maximum leverage available in your account is kind of like the top speed of your car. The effective leverage you use is like the actual speed you drive. Which is more important to you navigating the street safely?