What is This? Digital Modes on KX3

I have been having a blast lately with digital modes like PSK-31 and JT-65/JT-9.  My little KX3 is doing a great job even without having run the temperature compensation. Of course I am keeping my power to 2 or 3 watts - which helps a lot.

I have noticed a strange thing for a while, but I am just now getting around to asking about it.

When I look at the waterfall there is an area that is basically blanked out - for lack of a better term.

Here is a screen shot of the waterfall in WSJTX (JT-65).  You will notice the black area on the left.

Waterfall of WSJTX - What is "black" on left edge?

As you can see there is an area on the left that is in the frequency range, but it is "blacked out".  I wonder how many signals are in this area?

Those if you with a KX3 or those of you that might know what this is - please let me know!  If you know how to fix this, please let me know that as well!

I am looking forward to hearing the responses - I appreciate the help!