bsavestate for more than two tables

First of All I really adore jquery datatables ,it's greaat :)

My problem is :
I've have 6 datatables in my page . and I use

"bStateSave": true

for all of them .
But nothing is saved . I reviewed my cache information .I just found 2 datatables in my cache only .
I've removed bsavestate from all the datatables then I set it one by one and test ,I found out that the state is save for max two datatables only.
any help with this issue ?!

N.B, size range of each datatable is 1600-1800 KB .. I don't know is this browser cache size issue or is it an issue with datatables