It could be because one of those issues.
-
The permission
ACCESS_NETWORK_STATE
is in the Manifest of your app, which could trigger a false positive (search here and read this for more details). -
One of the extensions that you used are malicious, but the possibility of this is low. Or, you have extensions that are totally not harmless, but somehow the virus scanner is sensitive towards that. (read this).
If you think there are no issues with your app, it is best to contact them.