Неверное чтение размера 1 в тетрисе с использованием valgrind

Я пытаюсь написать тетрис динамический 2D массив строк и столбцов с именем data; Я создаю функцию edit_2Darray для дублирования исходного 2D-массива и увеличения длины каждого столбца, а в остальном я заполняю пробелом;

==21909== Invalid read of size 1
==21909==    at 0x100002C0A: Tetris::print() const (main.cpp:300)
==21909==    by 0x1000011CB: test_example() (main.cpp:59)
==21909==    by 0x100001053: main (main.cpp:36)
==21909==  Address 0x10080a9c1 is 1 bytes inside a block of size 2 free'd
==21909==    at 0x1000132F7: free (in /usr/local/Cellar/valgrind/3.11.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==21909==    by 0x100005188: Tetris::edit_2Darray(int, int) (tetris.cpp:214)
==21909==    by 0x1000056EC: Tetris::add_piece(char, int, int) (tetris.cpp:279)
==21909==    by 0x10000118F: test_example() (main.cpp:57)
==21909==    by 0x100001053: main (main.cpp:36)
==21909==  Block was alloc'd at
==21909==    at 0x100012EBB: malloc (in /usr/local/Cellar/valgrind/3.11.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==21909==    by 0x10005743D: operator new(unsigned long) (in /usr/lib/libc++.1.dylib)
==21909==    by 0x1000050DD: Tetris::edit_2Darray(int, int) (tetris.cpp:208)
==21909==    by 0x1000056EC: Tetris::add_piece(char, int, int) (tetris.cpp:279)
==21909==    by 0x10000118F: test_example() (main.cpp:57)
==21909==    by 0x100001053: main (main.cpp:36)
==21909==

Вот моя функция add_piece для фигуры I size и edit_2Darray ();

private:
int width;
int* heights;
char** data;

Tetris::Tetris(int aWidth) {
width = aWidth;
heights = new int[aWidth];
for (unsigned int i = 0; i < aWidth; i++) {
heights[i] = 0;
}
data = new char* [aWidth];
for (unsigned int j = 0; j < aWidth; j++) {
data[j] = new char[1];
data[j][0] = ' ';
}
}

void Tetris::add_piece(char c, int m, int n) {
int l = 0;
int max_h = 0;
if (m != 0 &&
m != 90 &&
m != 180 &&
m != 270) {
cerr << "INCORRECT ANGLE!" << endl;
}
if (n < 0 ||
n > width-1) {
cerr << "INCORRECT POSITION" << endl;
}
if (c == 'I') {
if (m == 0 || m == 180) {
max_h = get_max_height();
heights[n] += 4;
if (heights[n] >= max_h) {
edit_2Darray(heights[n], heights[n] - max_h);
}
data[n][heights[n]-4] = c;
data[n][heights[n]-3] = c;
data[n][heights[n]-2] = c;
data[n][heights[n]-1] = c;
}
if (m == 90 || m == 270) {
l = 0;
for (unsigned int k = 0; k < 4; k++) {
if (l < heights[n+k]) {
l = heights[n+k];
}
}
max_h = get_max_height();
heights[n] = l+1;
heights[n+1] = heights[n];
heights[n+2] = heights[n];
heights[n+3] = heights[n];
if (heights[n] >= max_h) {
edit_2Darray(heights[n], heights[n] - max_h);
}
data[n][heights[n]-1] = c;
data[n+1][heights[n]-1] = c;
data[n+2][heights[n]-1] = c;
data[n+3][heights[n]-1] = c;
}
}
}

void Tetris::edit_2Darray(int h, int num) {
for (unsigned int i = 0; i < width; i++) {
char* temp = new char [h];
for (unsigned int j = 0; j < h; j++) {
if (j >= (h-num)) {
temp[j] = ' ';
}
else {
temp[j] = data[i][j];
}
}
delete[] data[i];
data[i] = temp;
delete[] temp;
}
}

void test_example() {
std::cout << "=====================================================================" << std::endl;
std::cout << "test_example()" << std::endl;

Tetris tetris(6);
std::cout << "empty board with width = 6:" << std::endl;
tetris.print();
assert (tetris.get_width() == 6);

tetris.add_piece('O',0,1);
std::cout << "after adding first piece:" << std::endl;
tetris.print();
}