I am curious as to why I would receive a negative K/s rate in a bonnie++ benchmark report. Any one here know what is causing that?

Version 1.96			Sequential Output						Sequential Input				Random Seeks			Sequential Create						Random Create
	Size	Chunk Size	Per Char		Block		Rewrite		Per Char		Block				Num Files	Create		Read		Delete		Create		Read		Delete
			K/sec	% CPU	K/sec	% CPU	K/sec	% CPU	K/sec	% CPU	K/sec	% CPU	/sec	% CPU		/sec	% CPU	/sec	% CPU	/sec	% CPU	/sec	% CPU	/sec	% CPU	/sec	% CPU
Server1_2TB	2200000M	16k	1189	99	-1084822	99	-480587	49	1716	99	-994414	51	179.8	101
	Latency		14407us		5286ms		15117ms		12133us		255ms		2428us		Latency
Server1_1TB	1000000M	16k	1150	99	1220708	98	540486	49	2025	99	1138391	50	223.7	101	512	11784	61	588626	99	12658	56	11270	61	470702	99	12838	58
	Latency		14035us		8034ms		14505ms		10103us		17056us		8022us		Latency	26259us		109us		6102us		26528us		21us		96875us
Server2_2TB	2200000M	16k	1247	99	-1003436	90	-447695	43	2274	99	-968253	47	1466	111	512	11910	60	760180	99	13063	53	11972	57	633442	99	13572	55
	Latency		14019us		11942ms		17689ms		9172us		11503us		7277us		Latency	18819us		66us		4139us		12904us		14us		136ms
Server3_1TB	1000000M	16k	954	99	994090	98	501168	37	3333	99	871493	28	193.3	98	512	465	1	553893	100	218	0	467	1	640035	99	211	1
	Latency		18941us		30039us		73502us		6942us		17076us		7487us		Latency	3139ms		331us		45540us		44647us		24us		53750us