Texture not displaying properly - probably coordinates are wrong OpenGL, C++

I'll try to explain my problem with images. So this is a test texture I'm using for my OpenGL application:

As you can see, there is a 2-pixels wide border around the image with different colors for me to be able to see if coordinates are properly set in my application.

I'm using a 9-cell pattern so I'm drawing 9 quads with specific texture coordinates. At first sight everything works fine, but there is a small problem with displaying a texture:

In the picture I marked where is first quad, and where is the second one. As you can see, first one is displayed correctly, but second one smoothly goes from first quad's colors to it's own, but it should start with pure green and pink. So I'm guessing it's a problem with texture coordinates.

This is how they are set:

// Bottom left quad [1st quad]
glBegin(GL_QUADS);
    // Bottom left
    glTexCoord2f(0.0f, 1.0);                
    glVertex2i(pos.x, pos.y + height);

    // Top left
    glTexCoord2f(0.0f, (GLfloat)1.0 - maxTexCoordBorderY);  
    glVertex2i(pos.x, pos.y + height - m_borderWidth);

    // Top right
    glTexCoord2f(maxTexCoordBorderX, (GLfloat)1.0 - maxTexCoordBorderY);
    glVertex2i(pos.x + m_borderWidth, pos.y + height - m_borderWidth);

    // Bottom right
    glTexCoord2f(maxTexCoordBorderX, 1.0);
    glVertex2i(pos.x + m_borderWidth, pos.y + height);
glEnd();

// Bottom middle quad [2nd quad]
glBegin(GL_QUADS);
    // Bottom left
    glTexCoord2f(maxTexCoordBorderX, 1.0);          
    glVertex2i(pos.x + m_borderWidth, pos.y + height);

    // Top left
    glTexCoord2f(maxTexCoordBorderX, (GLfloat)1.0 - maxTexCoordBorderY);
    glVertex2i(pos.x + m_borderWidth, pos.y + height - m_borderWidth);

    // Top right
    glTexCoord2f((GLfloat)1.0 - maxTexCoordBorderX, (GLfloat)1.0 - maxTexCoordBorderY);
    glVerte