Landsat Overlay Problem

Student user of IDRISI here,

I have been trying to prepare Landsat 8 OLI images for image differentiation analysis but there appears to be a discrepancy in the sensor affecting the area covered:


This issue has been asked before and the user there was advised to use the RESAMPLE module, but I can't think why that would be appropriate, since here the images overlap perfectly fine and are already layered properly. The larger problem is that when using the OVERLAY and CROSSTAB modules the software layers the images to a single hard boundary, causing overlapping errors (like multiple river duplicates). 

I have tried using the WINDOW module but it still causes a shift. Has anyone else experienced this issue, and are there any instructions online on how to resolve? 


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