Spot the difference game having a strange behavior in Mobile

I'm making a spot the difference game but with words, like this: (When a word is clicked it tells you if there is one of the differents ones or not). As you can see it works fine in the editor, but when I test it on Android this happen Not pretty right? My principal suspect is the Canvas Scaler but i don't know how to fix this mess. Help please

Just in case here is my code:

     public class TextArranger : MonoBehaviour
     {
         [SerializeField] private RectTransform context;
         [SerializeField] private WordUI prefabWord;
         [SerializeField] private BoxCollider2D bounds;
    // (.....)
           public void showWords(List<string> texts)
             {
                 int i = 0;
                 if (texts.Count > 0)
                 {
                     foreach (string word in texts)
                     {
                         WordUI wordUI = Instantiate(prefabWord, context.transform);
                         //set word on UI 
                         int wordLength = wordUI.setPalabra(word);
                         wordUI.isDif=checkChanged(i);
                         //check if it fit in the same line
                         isSameLine(wordLength);
                         //set word position
                         wordUI.setLocation(lastX, lastY);
                         //set vars for next word
                         setNextPos(wordUI, wordLength);
         
                         i++;
                     }
                 }
             }
         
             private bool checkChanged(int i)
             {
                 foreach (int dist in textos.GetDistintos())
                     if (dist == i)
                         return true;
                 return false;
             }
         
             private void isSameLine(int wordLength)
             {
                 wordLength += offsetPalabras;
                 float aux = bounds.bounds.size.x - margenDer;
                 var aux2 = wordLength + lastX;
                 Debug.Log("la palabra llega hasta " + aux2 + " y el margen derecho esta en " + aux);
                 if (wordLength + lastX > (bounds.bounds.size.x - margenDer))
                 {
                     lastX = 12;
                     lastY -= 15;
                 }
             }
         
             private void setNextPos(WordUI wordUI, int wordLength)
             {
                 wordLength += offsetPalabras;
         
                 lastX += wordLength;
             }
 }

 public class WordUI : MonoBehaviour
 {
     [SerializeField] private Text palabra;
     public bool isDif;
     public RectTransform location;

 internal void setLocation(float x, float y)
 {
     location.anchorMin = new Vector2(0, 1);
     location.anchorMax = new Vector2(0, 1);
     location.pivot = new Vector2(0, 1);
     location.transform.position = new Vector3(x, y, 0);
 }

 private int CalculateMessageLength(string message)
 {
     int totalLength=0;
     
     Font myFont = palabra.font;  //chatText is my Text component
     CharacterInfo characterInfo = new CharacterInfo();

     char[] arr = message.ToCharArray();

     foreach (char c in arr)
     {
         myFont.RequestCharactersInTexture(c.ToString(), palabra.fontSize, palabra.fontStyle);

         myFont.GetCharacterInfo(c, out characterInfo, palabra.fontSize);

         totalLength += characterInfo.advance;
     }

     return totalLength;
 }
 internal int setPalabra(string word)
 {
     palabra.text = word;

     return CalculateMessageLength(palabra.text);
 }

 }