"Operations" column on Groups page in OnDemand wraps weirdly on anything but really wide browser windows

With a browser window of width ~1150 pixels, the text in the "Operations" column in the Group browser is wrapped oddly:

The HTML looks like this:

<thead>
    <tr>
        <th width="40%">
            Group Name
        </th>
        <th width="20%">
            Users
        </th>
        <th width="30%">
            Permission Schemes
        </th>
        <th width="10%">
            Operations
        </th>
    </tr>
</thead>

By changing the "Users" width down to 10% and bumping the "Operations" width up to 20%, it looks much better, even with a large number in the Users column:

This occurs in the latest versions of Safari, Firefox, and Chrome.