Right fixed table column overlaps left columns when you resize browser

Question

I have a table with a right fixed column and there are 6 columns on the left with an x-scroll. I used code similar to this

how do I create an HTML table with fixed/frozen left column and scrollable body?

This works for the most part, however this is on a responsive site, so when you scale down the page the right fixed column pushed over until about 400px and then starts to overlap the columns on the left. I applied a white background to the <td> but I would like for the right column just to force the other column to become hidden in the scroll, all the way down to the lowest browser width. Any ideas!

https://jsfiddle.net/TBankston/5L7jkbfq/

<div class="page-header">
    <h3>Charity</h3>
</div>
<div class="table-responsive">
    <table cellpadding="9" class="table-hover">
        <thead>
            <tr>
                <th>
                    @Html.DisplayNameFor(model => model.ID)
                </th>
                <th>
                    @Html.DisplayNameFor(model => model.EventName)
                </th>
                <th>
                    @Html.DisplayNameFor(model => model.Organization)
                </th>
                <th>
                    @Html.DisplayNameFor(model => model.District)
                </th>
                <th>
                    @Html.DisplayNameFor(model => model.Hours)
                </th>
                <th>
                    @Html.DisplayNameFor(model => model.Donation)
                </th>
                <th>
                    @Html.DisplayNameFor(model => model.TotalValue)
                </th>
                <th>
                    @Html.DisplayNameFor(model => model.ModifiedDate)
                </th>
                <th class="crud-links"> Options</th>
            </tr>
        </thead>
        @foreach (var item in Model)
        {
            <tr>
                <td>
                    @Html.DisplayFor(modelItem => item.ID)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.EventName)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Organization)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.District)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Hours)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Donation)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.TotalValue)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.ModifiedDate)
                </td>
                <td class="crud-links">
                    @Html.ActionLink("Details", "Details", new { id = item.ID })
                    @if (ViewBag.current_User.CanEdit())
                    {
                        <span>|</span>
                        @Html.ActionLink("Edit", "Edit", new { id = item.ID })
                        <span>|</span>
                        @Html.ActionLink("Delete", "Delete", new { id = item.ID })
                    }
                </td>
            </tr>
        }
    </table>
    <table>
        <tr>

        </tr>
    </table>
</div>