FSL Feat: Question about Contrast Estimability & Noise


I am new to FSL and have been tying to determine the contrast estimability of the tasks in my experiments. The noise level is obtained by pressing the “estimate from data” button on the GUI (Misc tab), which for some reason is coming out as a VERY high number (e.g. 79463830.00000). What could be causing this?

My main goal is to estimate contrast estimability, is there a way to do this without using the GUI? Or is there a way to troubleshoot what is causing this problem of high noise estimation? I am using the 3 column input for the design info.