Download num is not accurate

[sarahyc]

Currently we have multi builds and need monitor how many downloads and who download them for each build as HockeyApp's capability.
But the download for per build can't count in "Download" num. We are using the link : https://appcenter.ms/users/###/apps/###/distribute/releases/492, which is provided as below image right top "Download" button, after click the button and download the build, it keeps
Downloads
0 unique / 0 total

Please fix.