I have latest ACF 5.3.2.1 and WP and for some reason my file field looks odd:
https://www.dropbox.com/s/1ng4atymiq6xg9h/Screenshot%202015-11-06%2012.29.56.png?dl=0
Setup:
https://www.dropbox.com/s/o01rtr9xmzk01zn/Screenshot%202015-11-06%2012.30.46.png?dl=0
i am not sure since when it looks like this. and no matter which layout i choose. it always overlaps
Do you have some type of plugin installed, or a filter that’s altering the image icon used for a PDF file?
The attached image is what I see with a default WP install and no other plugins.