[Elecraft] K3 Spur on 160??!!

[Mike Furrey]

After the CQWW 160 contest this past weekend, I checked my signals on the Reverse Beacon Network and it appeared that the AC0C skimmer (545 miles NW of me) was picking up a spur on 1855.7 kHz! This occurred only at the AC0C skimmer and did not show on any other skimmers and only when I was running on 1830.3 kHz and did not show when I was running on any other frequency. I have done a cut-and-paste below. I was using my K3 barefoot and my antenna is an inverted L with one elevated radial up 20 feet. 

Is this something I should be concerned about?
73, Mike WA5POK

| AC0C |  WA5POK  | 1830.3 | CW CQ  | 38 dB | 25 wpm | 0919z 31 Jan  |
| AC0C |  WA5POK  | 1855.7 | CW CQ  | 13 dB | 25 wpm | 0919z 31 Jan  |
| K1TTT |  WA5POK  | 1830.3 | CW CQ  | 2 dB | 26 wpm | 0919z 31 Jan  |
| AC0C |  WA5POK  | 1830.1 | CW CQ  | 14 dB | 25 wpm | 0919z 31 Jan  |
| AC0C |  WA5POK  | 1855.7 | CW CQ  | 13 dB | 25 wpm | 0918z 31 Jan  |
| AC0C |  WA5POK  | 1830.3 | CW CQ  | 39 dB | 25 wpm | 0918z 31 Jan  |
| AC0C |  WA5POK  | 1830.3 | CW CQ  | 37 dB | 26 wpm | 0918z 31 Jan  |
| AC0C |  WA5POK  | 1855.7 | CW CQ  | 11 dB | 25 wpm | 0918z 31 Jan  |
| AC0C |  WA5POK  | 1830.3 | CW CQ  | 40 dB | 25 wpm | 0918z 31 Jan  |
| AC0C |  WA5POK  | 1855.7 | CW CQ  | 11 dB | 25 wpm | 0917z 31 Jan |