How to keep Thick border when filtering

Hi Guys,

First of all Happy New to you all I hope you had a good one.

Now, I have a problem when I AutoFilter. I have a spreadsheet which has a thick border from rows 5 to 100. I used the really thick border that you get from the Draw Borders drop down list the very last border line that is available.

What my problem is when I filter to one of the criteria that I choose, only some of the columns keep the thick border and some columns have the normal thin border.

Is this because I drew the borders manually with the Draw Borders tool?

How can I make it so that when I filter the bottom line will always show a thick border?

Thanks in advance for any help given.