Columns expand continuously with each sort

[djflorio]

Django 1.10 Python 3.5.2

Funny little bug here. Whenever I sort these two models in the admin site, their columns slightly expand horizontally. This continues as long as I sort the items, and the columns reset at a page refresh.

Initial view:

After sorting the items 3 times:

After sorting the items 10 times:

Here's the model being sorted in the above screenshots:

class WorkLogo(models.Model):
    name = models.CharField(max_length=200)
    image = models.ImageField(null=False)
    order = models.PositiveIntegerField(default=0, blank=False, null=False)

    def __str__(self):
        return self.name

    class Meta(object):
        ordering = ('order',)

And the code that adds the model to the admin site:

class WorkLogoAdmin(SortableAdminMixin, admin.ModelAdmin):
    model = WorkLogo

admin.site.register(WorkLogo, WorkLogoAdmin)