Clueless...

These are my chlorine levels and actions over the last couple of weeks... can anyone make sense of this?
Date - Time - FC- CC -Notes
5/29/2013 - 17:11:00 - 6 - 5 - got Taylor 2006
5/29/2013 - 21:49:00- 5.5 - ? - added 2 gal bleach around 8pm
5/30/2013 - 7:18:00 - 7.5 - 2
5/30/2013 - 19:30:00- 2.5 - 7.5 - added 2 gal bleach
5/30/2013 - 20:32:00 - 9.5 - 5
5/31/2013 - 6:47:00 - 4.5 - 9
5/31/2013 - 18:30:00 - 4 - 10 - added 4 gal bleach
5/31/2013 - 21:48:00 - 5 - 12.5
6/1/2013 - 7:08:00 - 5 - 11
6/1/2013 - 18:13:00 - 14 - 5
6/2/2013 - 8:01:00 - 10 - 7.5
6/2/2013 - 21:31:00 - 10 - 4 - pump motor seized this afternoon
6/3/2013 - 8:08:00 - 5 - 10 - pump off
6/3/2013 - 19:30:00 - 12 - 3 - pump off; added 2 gal bleach; vacuumed with catfish
6/4/2013 - 6:28:00 - 4 - 11.5 - pump off
6/4/2013 - 19:24:00 - 4- 12 - pump off; added 4 gal bleach; brushed pool; vacuumed with catfish
6/4/2013 - 20:28:00 - 6 -8.5 - pump off
6/5/2013 -17:49:00 - 6 - 10.5 - pump off; added 4 gal bleach; brushed pool; vacuumed with catfish
6/5/2013 - 21:53:00 - 3 - 16 - pump off

How is it possible to be at 6ppm FC, add 4 gal of bleach (in the shade near dusk) and 2 hours later be at 3ppm FC? And how does CC jump 5.5ppm at the same time? Other info: no algea (vinyl liner not slippery); water is clear but still has a slight green tinge; no CYA yet; no other chemicals. I just don't get it. Haven't had a CC level below 2 which is still ridiculously high... but 16ppm??? Argh.