Centering crosshair when played multiple times

[aweson]

Hi, I've been working on designing a study where a sound is played, a crosshair flashes, a sound is played, a crosshair flashes, a third sound is played, and a final crosshair flashes on the screen. The participant should press F if the third sound is the same as the first one, and they should press J if the third sound is the same as the second one. 
The issue that I'm having is that I want the crosshair to appear in the center of the screen each time, but instead it has been appearing from left to right even after the crosshair disappears. 

This is an example of my current setup:
Trial template: 
"MainTrialStimuliA":{
  "type": "AFC",
  "auto_advance": true,
  "delay": 0.1,
    "stimuli":  [["audioStim1", "crosshair", "audioStim2", "crosshair", "audioStim1", "crosshair2"]],
  "responses": [["ResponseF"]]
},

audioStmi1 (audioStim2 has the same setup):
{
  "type": "audio",
  "content": "dent retr 1 vcls vcng 0 aCa.mp3",
  "visible": false,
  "delay": 1
}


crosshair:
{
  "type": "text",
  "content": "+",
  "alignment": "center",
  "duration": 1,
  "size": "24px",
  "delay": 1
}

crosshair2:
{
  "type": "text",
  "content": "x",
  "alignment": "center",
  "duration": 1,
  "size": "24px",
  "delay": 1
}