I don´t know if that mystery miner is reading this forum, but check that you ZCash address is correct.
Today is third day that somebody is mining with wrong ZCash address.
Im getting twice a day 0.2 ZEC on my account and right now im not even mining zcash.
Im sorry for this miner, he/she is losing ZEC because of typo.
I would be so mad at me because of this typo.
What im saying check twice that address is correct and yours not someone else
Mods may delete or move it if its not by the rules.