Dear QIIME developers!
I have performed some diversity analyses on my fungal data using the qiime diversity coremetrics
and qiime diversity betagroupsignificance
. To look more into the beta diversity data, I downloaded the raw data from the qzv file, and also exported data from the BrayCurtis matrix. Furthermore, I did the same thing with the corresponding data in the Moving Pictures Tutorial. The data look somewhat different, and it would be great if you could help me with some input on this:

In the last column in the raw data (Distance), almost all of my values are “1” (actually 47317 of 68746)
Additionally, the rest of the values have a maximum of 4 decimals, and always end with 5 or 0 (0.0125, 0.025, 0.0375, 0.05 and so on). The corresponding data from the MPT looks more “random” (e.g. 0.810516772 and 0.224841342), and only 70 of 823 is the value “1”. Do you know why? Could it have something to do with the rarefaction? 
Looking at the distance matrix, the same phenomenon seems to occur: Lots of 1values, and the rest have a maximum of 4 decimals, and always end with 5 or 0. Again, the distance matrix from MPT has more decimals, and looks more “random”.
Grateful for some information or suggestions on this!
Whole commands:
qiime diversity coremetrics \
itable table.qza \
psamplingdepth 80 \
mmetadatafile metadata.txt \
outputdir Diversity_metrics
qiime diversity betagroupsignificance \
idistancematrix Diversity_metrics/bray_curtis_distance_matrix.qza \
mmetadatafile metadata.txt \
mmetadatacolumn SampleType \
ovisualization bray_curtis_sample_type.qzv \
ppairwise