Doubled rx of WSPR signal?

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DE8MSH
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Joined: 2010/01/02 - 08:26
Doubled rx of WSPR signal?

DB5BZ mentioned that my upload of his broadcast is done twice per two minute duration. I verified it and other upload are done two times, too:

2010-01-06 07:16 DH5RAE 3.594164 -5 0 JN68pv 5 DE8MSH JO43kb 557 328
2010-01-06 07:16 DH5RAE 3.594063 -22 0 JN68pv 5 DE8MSH JO43kb 557 328

2010-01-06 07:14 DJ5SQ 3.594129 -24 -1 JN37tx 10 DE8MSH JO43kb 572 8
2010-01-06 07:14 DJ5SQ 3.594029 -5 -1 JN37tx 10 DE8MSH JO43kb 572 8

2010-01-06 07:38 OE3BWW 3.594096 +2 0 JN77 5 DE8MSH JO43kb 756 327
2010-01-06 07:38 OE3BWW 3.594197 -16 0 JN77 5 DE8MSH JO43kb 756 327

2010-01-06 08:12 PA0HCK 3.594025 +6 0 JO33ld 5 DE8MSH JO43kb 128 93
2010-01-06 08:12 PA0HCK 3.594125 -18 0 JO33ld 5 DE8MSH JO43kb 128 93

Most of the doubled decodings have a less SNR and a better one. E.g. OE3BWW: +2 and -16 in one decoding. The are two frequencies, too.

Question: what's wrong? I only got one rx and one antenna (shown before in blog).