iframe height and width being removed by wordpress?

I’m on 3.9.1 now, but the same problem is occurring in 3.8.X.

If I use the shortcode [bandcamp] to embed i get the following rendered on the post:
<p>Holy, Holy, Holy
<iframe width=”” height=”” frameborder=”0″ allowtransparency=”true” style=”position:relative;display:block;width:px;height:px;” src=”http://bandcamp.com/EmbeddedPlayer/v=2/album=3563716376/size=small/bgcol=ffffff/linkcol=0687f5/”></iframe></p&gt;

NOTICE: the width and height don’t have any values????

IF, however, I paste in the <iframe> code in the text editor instead of visual editor… the height and width is correct!:
<iframe style=”border: 0; width: 100%; height: 42px;” src=”http://bandcamp.com/EmbeddedPlayer/album=3563716376/size=small/bgcol=ffffff/linkcol=0687f5/track=3071271614/transparent=true/&#8221; seamless>Together for the Gospel Live II by Sovereign Grace Music – Bob Kauflin</iframe>

AND!!! If after using the text editor (which works with the iframe code above) I then switch to the visual editor… IT REMOVES THE WIDTH/HEIGHT STYLES!!!!!

This is happening on default themes… 2012, 2013, 2014 too!!!

WHAT GIVES?????

SOOOO weird.

https://wordpress.org/plugins/wp-bandcamp/