Console buffer problem?

In the snippet of code below i have it output lines to form a box around the console window. But in the very last sqaure on row 26 column 80 when i place a sqaure it pushes
the text down to the next row. As in.
What i want:
▓------▓
|------|
|------|
|------|
|------|
▓------▓
What the console window looks like:
|------|
|------|
|------|
|------|
▓------▓
Newline

Im wondering what the problem is. And the ReadString Function is not the source of the problem. I have set the buffer size to X 80 Y 26 and window size to 800 350.

The objective would be to place a ascii character in that sqaure without it in a way "Pushing the screen down 1 row".

Code:

---

void LoadGwindow()
{
    int LeftSide = 0;
    int RightSide = 79;
    int TopSide = 0;
    int BottomSide = 25;
    string HLine = "-";
    string VLine = "|";
    char Sqaure = char(178);
    string Corner(&Sqaure, 1);
    //Loading Frame//
    //Top//
    ReadString(HLine,0,78,LeftSide+1,TopSide,2);
    //Bottom//
    ReadString(HLine,0,78,LeftSide+1,BottomSide,2);
    //Left//
    ReadString(VLine,0,24,LeftSide,TopSide+1,1);
    //Right//
    ReadString(VLine,0,24,RightSide,TopSide+1,1);
    //LeftTopCorner//
    ReadString(Corner,0,1,LeftSide,TopSide,1);
    //RightTopCorner
    ReadString(Corner,0,1,RightSide,TopSide,1);
    //LeftBottomCorner
    ReadString(Corner,0,1,LeftSide,BottomSide,1);
    //RightBottomCorner
    ReadString(Corner,0,1,RightSide,BottomSide,1);
}

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