This probability by chance depends on the total number of observations that were made per column, instead of the number of sequences per Code (=row).
▪Switch to the tab Joint frequencies expected by chance to see the results:
The results are calculated based on the following formula:
mGT = Estimate of the expected frequencies
xG+ = Summary of the observed (=given) frequencies per row.
x+T = Summary of the observed frequencies per column
x++ = Total number of tallies in the table