OrderType() returns wrong in a complicated EA while it's correct in another simple EA

Hi all,

I have two pending orders for test purpose. One is buy limit (OP_BUYLIMIT is 2), another is sell stop which is OP_SELLSTOP 5.

There are only those two pending orders, no any other orders or trades.

I put the following code in an almost empty EA, in the OnInit function,

        for(int i = 0; i < OrdersTotal(); ++i) {
                if(! OrderSelect(i, SELECT_BY_POS, MODE_TRADES)) {
                        continue;
                }
        
                Print(OrderSymbol() + " " + (string)OrderTicket() + " " + (string)OrderType());
        }

It prints the correct information and order types.

However, if I put the code in a complicated EA, even in the OnInit function, the order type is always 4 (OP_BUYSTOP) for both two orders, though the symbol and ticket are correct. I'm 100% sure there are no any buy stop orders.

The EA includes quite a lot of code, which the size of EX4 exceeds 500 KB, and it uses a DLL which is more than 2 MB. It's so complicated that I can't post any piece of code of it.

Did any one see that OrderType returns wrong result? If so, why and how to solve it?

Thanks