I run an experiment with one independent variable let say A (I manipulate this variable across two conditions for insistence under one condition participants use the A software and under another condition they did not). The experiment has three dependent variables let say B, C, D.It is a repeated measure design, so I compared each of the dependent across two conditions

The results of paired t test showed that when participants used the software A, the dependent variables B and C increase, while the dependent variable C decrees.

But when I run correlation between the dependent variables B, C, D I found no correlations. I was expecting positive correlation between B and C and negative correlation with C.

To me it looks like if A cause the increase in B and C then we would expect that B and have positive correlation.

So, the questions is do dependent variables correlates ?