The PIVX Core wallet will automatically convert a portion of your piv to zPIV.  By default this is 10% but it is configurable anywhere between 0 and 100%.  It can also be fully disabled as outlined below.  See here for more information

Method 1

(GUI Only)

  1. Open the PIVX-QT software
  2. Select Settings > Options

  3. Uncheck the "Enable zPIV Automint" checkbox

Method 2

(GUI and CLI)

  1. Close your PIVX wallet (or stop the pivxd daemon if you're running CLI)
  2. Navigate to your PIVX data directory
  3. Open pivx.conf (Click here if you are having trouble opening it on a Mac)
  4. Add the line

Video guide here: 

Method 3
(CLI only)

  1. When starting the pivxd daemon, use the startup switch as follows:
    $ ./pivxd -enablezeromint 0

    Please note that this will only disable the automint during this session.  If the wallet starts up without this startup switch afterwards, it will be reenabled