So Confused....

I don't understand why I'm gaining weight. ok to start. My BMR (basic metabolic rate) is 1776.95 calories. (what i burn by living) If I eat 1100-1200 calories and I dont exercise or burn less than 400 calories I will gain weight. If I burn more than 400 calories I will normally stay the same. Dont get that right there... But im really not getting what has been going on the past 2 weeks. I had my fill July 11th. I was 214 I lost 6 pounds in the next few days then since then I have gained 4. I gained 2 pounds today and I do not understand.. here are some numbers and charts. I have been drinking at leats 64 oz water a day. Can anyone help me???????

7/4/11 451 cals burned        no weight         1371 c 78.3 p
7/5/11 0 cals burned            no weight         1126 c 51.4 p
7/6/11 628 cals burned        215.4              859 c 48 p
7/7/11 0 cals burned            215.4              1079 c 46.2 p
7/8/11 727 cals burned        no weight        1000 c 66.4 p
7/9/11 0 cals burned            215.2             1064 c 60.9
7/10/11 658 cals burned      no weight        648 c 62.9 p
7/11/11 537 cals burned      214.0  FILL   684 c 47.7 p
7/12/11 0 cals burned          213.4             702 c 23.2 p
7/13/11 466 cals burned      212.0             1117 c 68 p
7/14/11 0 cals burned          212.0             867 c 64.8 p
7/15/11 543 cals burned      211.4             1179 c 87.4 p
7/16/11 270 cals burned      210.4             1846 c 38.2 p
7/17/11 0 cals burned          208.6             995 c 39.2 p
7/18/11 831 cals burned      210.2             732 c 64.8 p
7/19/11 669 cals burned      210.8             657 c 47p
7/20/11 622 cals burned      210.2             560 c 57 p
Today 737 cals burned        212.2             558 c 60.3 p