Two sample T test GRF

Hi I'm running two sample T test between two group Control and Patient (FC Zmap), after correction with GRF ( voxel p<0.025, cluster p<0.1, two tailed). I got some correlation with my seed and Cingulum cortex in the control group ( that was my hypothesis), but nothing in the other side with patient group. then I run separate One sample t test for my FC Zmap for each group separately , after using GRF ( voxel p<0.01, cluster p<0.05, one tailed). I got some correlation with my seed in both group. with the control group with Cingulum cortex and with patient group with Caudal_putamen ( that was my hypothesis) 1- My first question is the p value that i enter of GRF correction are Right ? is it a valid Test ? 2-Why could not see the same effect for two sample T test in patient group 3- how can i interpret my one sample T test : can i say that there is a difference between the two group ? Best wishes