Why was a stop order sent (instead of limit order)?

Hello support, 

Here is the information regarding my issue: 

- I used the DRAG & DROP order. As I placed a buy order clearly below current prices, my understanding is that a LIMIT order should have been placed. 

- However, a STOP order was sent and therefore executed at a much higher price (please see below). 

- I am using a Demo account (Pepperstone). 

- The order was executed 1 ms after it was sent (please see below), so basically instantly executed. 

- I am using tick charts (the trade was placed in a 150-tick chart). 

I can't understand why a STOP order was sent, as prices were clearly above already for some time (several ticks) before my order was sent. This can be seen in the 2-tick chart (please refer to the first image). In my understanding, since I was using Drag & Drop, the platform should have automatically chosen to send a LIMIT order.

Thank you very much for your clarifications and assistance. 

Kind regards.