Blame calculation problem: FileRevision gives different line diff than blame calculator

2015-12-09 19:51:53,146 DEBUG [IncrPing2 P4-swarm-B ] fisheye BlameChunksCalculator-applyHunks - Applying hunks; oldBlame=[0-1:301325], hunks=[<0:1, 0:1>], hunksRevId=301788
2015-12-09 19:51:53,148 DEBUG [IncrPing2 P4-swarm-B ] fisheye BlameChunksCalculator-applyHunks - Applying hunks; oldBlame=[0-1:301788], hunks=[<0:1, 0:1>], hunksRevId=301789
2015-12-09 19:51:53,149 DEBUG [IncrPing2 P4-swarm-B ] fisheye BaseBlameAndLinecountCalculator-calcBlame - Problems calculating blame for guest/perforce_software/sdp/main/Version@16640, will fetch from repository instead
com.cenqua.fisheye.rep.AuthorBlameException: Possible error adjusting author linecount for guest/perforce_software/sdp/main/Version@16640 301789: Diff adds to 0 instead of -1: {} (P4RevInfo{P4RevInfo=guest/perforce_software/sdp/main/Version@16640, revId=301789, author=tom_tyler, comment=Updated version for packaging., date=Wed Dec 09 19:52:51 CET 2015, copyFrom=null, ancestors=[guest/perforce_software/sdp/dev/Version@16639]})
        at com.cenqua.fisheye.rep.BaseBlameAndLinecountCalculator.calcBlameBasedOnAncestor(BaseBlameAndLinecountCalculator.java:309) [fisheye.jar:?]
        at com.cenqua.fisheye.rep.BaseBlameAndLinecountCalculator.calcBlame(BaseBlameAndLinecountCalculator.java:243) [fisheye.jar:?]