hehe, everything looks fine now.
Let me give you some tips.
When you measure full range (as opposed to sub measurements up to 200Hz), then you will get comb filtering. These are reflections that make it difficult to see the underlying trend of the response, and is perfectly normal. To see the signal properly you turn on 1/3 octave smoothing (selectable in the left REW panel). Don't use smoothing for sub measurements, but certainly turn it on for full range.
For subwoofers, always use the standard Vertical graph axis of (45dB - 105dB) and the Horizontal graph axis of (15Hz - 200Hz) using the Graph Limits button in the top right corner of REW.
For full range, use the standard Vertical graph axis of (45dB - 105dB) and the Horizontal graph axis of (15Hz - upper limits you desire, i.e. 20KHZ - certainly no higher than your soundcard can extend).
For full range, as indicated above, enable smoothing to eliminate the comb filtering. Use a 1/3 octave smoothing.
So, with that new knowledge, let's see your graph with the correct graph scale and with smoothing on.
brucek