Dictionary doesn't returns value from different class when it contains it

Im attempting to save information about users SteamID and his position in game, here is the code through which I teleport the person to the saved position each 0.5 seconds, and it works perfectly returning this information in console

Key: 76561198333850828, Value: (605.0, 41.8, 618.5)

  IDictionary<Steamworks.CSteamID, Vector3> numberNames = new Dictionary<Steamworks.CSteamID, Vector3>();

                        while (numberNames.Count > 0)
                        {
                            foreach (KeyValuePair<Steamworks.CSteamID, Vector3> info in numberNames)
                            {
                                UnturnedPlayer steamidplayer = UnturnedPlayer.FromCSteamID(info.Key);
                                steamidplayer.Teleport(info.Value, 0);
                                Console.WriteLine("Key: {0}, Value: {1}", info.Key, info.Value);
                                await Task.Delay(TimeSpan.FromSeconds(0.5));
                            }
                        }

Yet when I attempt to remove the information from dictionary in a different class it says that dictionary does not contain anything

        internal void remname(Steamworks.CSteamID SteamID)
        {
            if (numberNames.ContainsKey(SteamID))
            {
                numberNames.Remove(SteamID);
            } else
            {
                Console.WriteLine("Doesnt contains");
            }
        }

And I have absolutely no idea what might have possibly caused this problem.