Video File Names Not Showing Correctly In Default Video Browser

Hi folks,
I have taken the plunge and moved from my iPhone 4s to a new Galaxy Note 2. And I'm loving it.

Everything is working very well and really fast compared to some tasks I used to do on the iPhone. Although I do have 1 question.

When i transfer videos/films across either from Kies or just drag and drop I am noticing that in the default samsung video app that not all my file names are being shown. Instead they have a weird symbol.

Do you have any idea why this is happening?

Also when I watch them via any other 3rd party app they are all fine.

Cheers

Dave