Im comparing the differences between 2 values from to different groups. The results i retrieved from the MW test gave a significant P value for when comparing the values of 8.1 and 30.1 BUT NO SIGNIFICANT P VALUE for 2 and 42.9 which is clearly a increased difference. These results im putting forward are important and I just wanted to know if anyone can explain these results and if this is normal for this kind of test. Thanks in advance for any help!

PS if this helps this was the data used for the 2 groups:

Group A

0% 0% 19.4% 8% 6% 12% 11.5% MEAN 8.1%

0% 0% 13.8% 0% 0% 0% 0% MEAN 2%

Group B

23% 14.2% 20% 60% 0% 41.6% 52.6% MEAN 30.2%

100% 0% 0% 100% 0% 100% 0% MEAN 42.9%