The derivation of array TileId[] is wrong in Sec. 6.5. I think the first two loops, that are

...
for( j = 0, tileId = 0; j <= num_tile_columns_minus1; j++ )

for( i = 0; i <= num_tile_rows_minus1; i++, tileId++ )

...

should be

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for( j = 0, tileId = 0; j <= num_tile_rows_minus1; j++ )

for( i = 0; i <= num_tile_columns_minus1; i++, tileId++ )

...

If the existing loops are correct as they are, then the next two lines need to be corrected. Instead of

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for( y = RowBd[ j ]; y < RowBd[ j + 1 ]; y++ )

for( x = ColBd[ i ]; x < ColBd[ i + 1 ]; x++ )

...

they should be

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for( y = RowBd[ i ]; y < RowBd[ i + 1 ]; y++ )

for( x = ColBd[ j ]; x < ColBd[ j + 1 ]; x++ )

...

Because the length of RowBd[] and ColBd[] are num_tile_rows_minus1+2 and num_tile_columns_minus1+2, respectively.