JoinMap outputting numbers too big to represent cM

Question

[iaagosch]

Hi!

I have SNP microarray data from Illumina and I'm trying to make a linkage map with the markers.

Comparing our groupings with previous articles the regions found make sense, but the position itself for the markers (in cM) doesn't. It's my first time dealing with this kind of data and analysis.

I have no idea what might be causing this situation