Required Checkbox validation works in reverse for Html.CheckBoxFor

I have a checkbox validation before i submit the page. But it works in reverse. It's displaying error message when i check the box instead of opposite. I don't know where im doing wrong.

My ViewModel

[Display(Name = "Terms and Conditions")]
[Range(typeof(bool), "true", "true", ErrorMessage = "Please accept Terms & Conditions")]
public bool IsTermsAccepted { get; set; }

My View

<div class="row col-lg-offset-2 top-buffer">
                @Html.CheckBoxFor(model => model.IsTermsAccepted)
                @Html.LabelFor(model => model.IsTermsAccepted)
            <br>@Html.ValidationMessageFor(model => model.IsTermsAccepted)
        </div>

Thank you for your time!