Emails not holding formatting

Hi,

I redesigned my notification email to look like an invoice.  I then saved it and when I go back in to edit it again it reverts back to the original default.  I have tried this about 10 time on several forms and it happens on every one.

I am using a MAC with Firefox 38.0.1

What I'm trying to use:

<table style="background-color: #d4d7d6; width: 100%;" border="0" cellspacing="0" cellpadding="5">
<tbody>
<tr>
<td style="text-align: center;"><span style="font-size: large;"><strong>INVOICE</strong></span></td>
</tr>
</tbody>
</table>
<p>&nbsp;</p>
<table style="width: 100%; border: 1px solid #000000;" border="1" cellspacing="0" cellpadding="5">
<tbody>
<tr style="background-color: #d4d7d6;">
<td style="width: 50%;">&nbsp;<strong>Seller</strong></td>
<td>&nbsp;<strong>Buyer</strong></td>
</tr>
<tr>
<td>
<p>&nbsp;ProWax Syetems<br />1628 Long Run Road<br />Schuylkill Haven, PA 17972<br />570-739-1434<br />ProWax1.com</p>
</td>
<td>{fullName} <br />{phoneNumber5}<br />{email4}         <br /></td>
</tr>
</tbody>
</table>
<p>&nbsp;</p>
<p>{id}<br /><span style="font-size: small;">{DATE:Date-US}</span></p>
<table style="background-color: #d4d7d6; width: 100%;" border="0" cellspacing="0" cellpadding="5">
<tbody>
<tr>
<td style="text-align: center;"><span style="font-size: large;"><strong>DETAILS</strong></span></td>
</tr>
</tbody>
</table>
<p>Products         {products}</p>

Strange.  I just added the code to my email form above your default code leaving your code intact.  It then held the formatting when I saved it and went back in.  Once I remove your default code it clears everything.

Is there something I need to do?

CORRECTION!

It held it for about 2 Min.  It now reverted back to your default.

I understand that this is what you are trying to do: 

I have noticed that you have not unlocked the Data Table yet, so modifications will only revert back to the default table. 

After unlocking the Data Table, open the HTML Source editor and paste your codes, then click Update from the HTML Source editor window then click Finish from the Compose Email and Save your form. 

I hope this helps. Let us know if you need further assistance. Thank you.