Font and textures issues on Android device

Hello,

I'm posting here because I need your help on an issue that never happend to me before.

Context:

I'm working on an Escape Game and I need to create an App for one of our escape room. In the App, the players need to find where the terrorists have planted bombs and then, send mine-clearing squads at those locations.

For now, I have two scenes. In the first one, players select a squad, in the second they select a world location.

First scene: First Scene UI

As you can see, there are three slots for three squads. The players can click on the green buttons to select one squad. Once the button is clicked, we go to the second scene.

Second scene: Second Scene UI

In this scene, players have to select a city on the world map. Once they choose one, a list of the city's places appears on the right side of the screen (buttons). When they select a place, the list then displays a list of potential bomb locations on the current place. At the end, they select a location to send the squad. A confirmation pop up appears:

Pop Up

And we return to the first scene.

To make it short : select a squad > select a city > select a place > select a bomb location > return to squad selection.

After the App returns to the first scene, sh*t happens...

When I select an other squad and then go on the second scene, texts start to bug as textures do. I can find artifacts like this :

Artifacts

Or sometimes, some letters disapear... like this :

Font

Or sometimes, the world map disapear and I just have my UI on a black background.

I only have this problem when I'm on the targeted device, a Samsung Galaxy S7. The font I use is called "Monotone" and is a .ttf

I'm not doing something complicated with my code. The most "exotic" thing is the code linked to my confirmation panel.

Confirmation Panel code :

 using UnityEngine;
 using UnityEngine.UI;
 using System;
 
 public class TargetConfirmationPanel : MonoBehaviour
 {
     public Text locationText;
     public Button validateButton;
 
     public void OpenPanel(string city, string place, string bombLocation, Action callback)
     {
         gameObject.SetActive(true);
 
         string targetString = "<i>" + city + " > " + place + " > " + bombLocation + "</i>";
         locationText.text = targetString;
 
         validateButton.onClick.AddListener(() => {
             callback();
         });
     }
 
     public void ClosePanel()
     {
         validateButton.onClick.RemoveAllListeners();
 
         gameObject.SetActive(false);
     }
 }

A callback on OpenPanel method that I call in another script :

 confirmationPanel.OpenPanel(
                 _currentCity.name, 
                 _currentPlace.name, 
                 _currentBombLocation.name, 
                 null);

So if you have any ideas, please help me :'(

Thanks for reading :D