Ok so we had our sac today

it was pretty straightforward; sultanas in a sucrose solutions of 0%,2%,5%,10%,20% and 30%
although we don't complete our discussion til next week because of camp
anyway, I've worked out my %change, and it's all over the place :/
we left them for about 40 minutes..
and yeah i expected there to be a stage where it (the osmosis rate) changed because of the sucrose content within the sultana
and this is what i got
0%= 17% + change in weight
2%= 18% + change in weight
5% = 22% + "" ""
10%= 16% +
20% = 9% +
30% = 15% +
(all gained weight, non lost it ><)
is the discrepancy most likely an error in the 30% jar?? i'd expect it to continue going down.....
any help would be appreciated!! thankyou!