问ggplot中柱形图变成小细线，求求大家帮帮忙？

代码：

ggplot(Gdata,aes(x=start,y=log2(rich),fill=group))+

geom_bar(stat='identity',position='dodge') #position='dodge') 则不进行堆叠

当然我也换过geom_col 也是这样。

数据： 共计890

start rich group

8800127 133.5397 load

42086190 44.51791 load

37481091 85.48868 load

11368045 15.50455 load

74609448 16.00285 load

79245463 337.6546 load

46152388 71.48584 load

9494640 61.99263 load

22831399 14.00352 load

74304012 12.50492 control

2283345 21.95965 control

47184670 11.99967 control

21223273 21.50357 control

12883618 56.85489 control

9016884 85.5763 control

63788480 16.49958 control

75489765 18.48119 control

12597659 36.97695 control

2411307 26.00531 control

49249573 13.49834 control