In Google Analytics I see some strange screen names:
sbwc.rf.lk.jc.gzh.trd
lyi.lcvx.oalsl.a
dfz.eoug.vafjc.a
iic.fv.xtd
Those names are not present in the original Android app and are also not in the Proguard mappings file. Also, statistics show app versions I never published. Does this mean that somebody pirated the app?