OnGUI hover button in built mode

Hey, have anyone faced similar issue with function OnGUI, please see below:

I know that it's obsolete function but still I am not getting why its happening.

for example, OnGUI I use following simple code:

Code (CSharp):

1.     private void InitStyles()
2.     {
3.         if (currentStyle == null)
4.         {
5.             currentStyle = new GUIStyle(GUI.skin.box);
6.             currentStyle.font = font;
7.             currentStyle.fontSize = 25;
8.             currentStyle.alignment = TextAnchor.MiddleCenter;
9.             currentStyle.hover.textColor = Color.red; //this line does not work in built mode
10.  
11.             currentStyle.normal.background = MakeTex(1, 1, defaultColor); //this line does not work in built mode
12.             currentStyle.hover.background = MakeTex(1, 1, hoverColor); //this line does not work in built mode
13.  
14.         }
15.     }

Code (CSharp):

1.     void OnGUI()
2.     {
3.         //If its not belong to actual player, return
4.         if (!isLocalPlayer)
5.         {
6.             return;
7.         }
8.         //end
9.  
10.         GUI.Label(new Rect(30, Screen.height - 380, 30, 30), Time.time.ToString(), blackText);
11.  
12.         InitStyles();
13.  
14.         //Show properties!
15.         if (GetSelectedObjects()[randomlyGeneratedRaceId] != null) //lookObj != null
16.         {
17.  
18.             // Mob mob = lookObj.GetComponent<Mob>();
19.             Mob mob = GetSelectedObjects()[randomlyGeneratedRaceId].GetComponent<Mob>();
20.  
21.             _mobProperties = "Name:  " + mob.mobName + " [" + convertorType(mob) + "]\n" +
22.                          "Cost: <b>" + mob.cost + "</b> silver \n" +
23.                          "Population: " + mob.population + "\n" +
24.                          "Attack type: " + convertorRange(mob) + " [" + mob.attackRange + " m] \n" +
25.                          "Hitpoints: " + mob.hp + " [Regen: " + mob.hitPointsRegen + " hp/s]\n" +
26.                          "Attack speed: " + mob.attackSpeed + " hit/s \n" +
27.                          "Damage: " + mob.damage + "[" + mob.damageType + "]\n" +
28.                          "Armor: " + mob.armor + "[" + mob.armorType + "]\n" +
29.                          "Movement speed: " + mob.movementSpeed + " m/s";
30.         }
31.  
32.         Rect buildingBtnRect1 = new Rect(0, Screen.height - 70, 70, 70);
33.         Rect buildingBtnRect2 = new Rect(71, Screen.height - 70, 70, 70);
34.         Rect buildingBtnRect3 = new Rect(142, Screen.height - 70, 70, 70);
35.         Rect buildingBtnRect4 = new Rect(213, Screen.height - 70, 70, 70);
36.  
37.         //Click on button (show lookobj)
38.         if (GUI.Button(buildingBtnRect1, new GUIContent("1", _mobProperties), currentStyle))
39.             SetId(0, true);
40.         else if (GUI.Button(buildingBtnRect2, new GUIContent("2", _mobProperties), currentStyle))
41.             SetId(1, true);
42.         else if (GUI.Button(buildingBtnRect3, new GUIContent("3", _mobProperties), currentStyle))
43.             SetId(2, true);
44.         else if (GUI.Button(buildingBtnRect4, new GUIContent("4", _mobProperties), currentStyle))
45.             SetId(3, true);
46.  
47.         //[Hover]
48.         if (buildingBtnRect1.Contains(Event.current.mousePosition)) //Event.current.mousePosition //Input.mousePosition
49.             SetId(0, false);
50.         else if (buildingBtnRect2.Contains(Event.current.mousePosition))
51.             SetId(1, false);
52.         else if (buildingBtnRect3.Contains(Event.current.mousePosition))
53.             SetId(2, false);
54.         else if (buildingBtnRect4.Contains(Event.current.mousePosition))
55.             SetId(3, false);
56.  
57.         //[Hover tooltip]
58.         if (lookObj == null) //Structure is already showen, hide tooltip
59.             GUI.Label(new Rect(30, Screen.height - 280, 30, 30), GUI.tooltip, blackText);
60.     }

In unity editor everything works fine (in first video) and in built edition its not working properly (seems like these functions are called just when I move camera).

Working in unity editor:

Not working in built version: