C# Windows form won't load from already exsisting form

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C#

Windows

forms

C# Windows Form Application project. I have a menu form which has buttons to load other already created forms.

private void cmdReporting_Click(object sender, EventArgs e)
{
    reporting frm = null;
    if ((frm = (reporting)openCheck(typeof(reporting))) == null)
    {
        frm = new reporting();
        frm.Show();
    }
    else
        frm.Select();
}

The form it is trying to load is named reporting. This code is identical to WORKING code that loads other forms. This is the only one out of 5 that won't load. It does not throw an error either.

Is there a setting I'm missing in the GUI?

Added Code for openCheck method

public static Form openCheck(Type FormType)
{
    foreach (Form OpenForm in Application.OpenForms)
    {
        if (OpenForm.GetType() == FormType)
            return OpenForm;
    }

    return null;
}