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Tetris removin rows problem.

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Hello! I am currently writing a tetris game and i have some trouble with my RemoveRow() function. It is suppose to check the whole playarea ( a [10][20] array ) if there are a complete row somewhere. If so, it shall remove it, move the part of the playarea that is above the row down by one unit. And clear out the top row. All works fine when i only remove one row. But if i remove two rows at once, i can tell by the score that the remove loop were run three times instead of two. I can''t figure out why this happens. This is the code:
void CTetris::RemoveRows()
	int x,

	// true if a fullrow is found, else false.

	bool fullrow;

	for( y = 0 ; y < PLAYAREA_MAXHEIGHT ; y++ )
		// Set fullrow to true.

		fullrow = true;

		// Check if there''s a gap in the current row

		for( x = 0; x < PLAYAREA_MAXWIDTH ; x++ )
			if( BackArea[x + PLAYAREA_OFFSET][y + PLAYAREA_OFFSET] == 0)
				fullrow = false; // if there is, set fullrow to false

		if( fullrow == true )
				for( y2 = y ; y2 > 0 ; y2--)
					for( x2 = 0 ; x2 < PLAYAREA_MAXWIDTH ; x2++ )

				for( x = 0 ; x < PLAYAREA_MAXWIDTH ; x++)
					BackArea[x + PLAYAREA_OFFSET][0 + PLAYAREA_OFFSET] = 0;

				Score = Score + 100;
				if( Score >= 1000 * Level )
					if( m_pTimeInterval >= 100 )
						m_pTimeInterval = m_pTimeInterval - 50;

				// Play deleterow sound



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