Following the StackOverflow guidance, I have reprojected raster layers into WGS84/UTM 36N using the Raster-> Warp -> Reproject tool. According to the Raster Properties, all the rasters are now in the same CRS; however, the coordinate system is different and the rasters do not overlap (even though "On The Fly Projection" is on). Here are two screenshots of the problematic rasters with the different coordinates:
Based on comments from other threads, I understand that the units for the UTM projections is meters; however, the re-projection doesn't seem to properly changing the coordinate units. One remains in longitude/latitute while the other is in decimal degrees. Based on advice online, I have tried starting from scratch to ensure that the Map Project projection is correct, but nothing appears to work. Does anyone have any ideas? I am using QGIS 2.18.