Finding the REAL certified speed of the disc is easy:
Download DVD.Identifier ( http://DVD.Identifier.cdfreaks.com )
Run it on the discs and post here, should look something like this:
Unique Disc Identifier : [DVD-R:PRINCO]
Disc Type : [DVD-R]
Manufacturer ID : [PRINCO]
Disc Application Code : [Unrestricted Use : Consumer Purpose]
Recording Speeds : [1x - (2x)]
Blank Disc Capacity : [2,298,496 Sectors = 4,489.3 MB = 4.38 GB]
The speed on the "Recording Speeds" line is the real certified speed of the disc. If it says 1x-(2x) then it's only 2x and you should whine at the manufacturer/dealer of your media. If it says 1x-2x-4x then you should whine at Lite-On for not supporting the media at 4x.
Edit: oops I see you posted this already :o
And there it says 1x-(2x) = this is 2x media = whine at media manufacturer/dealer. This is not Lite-On's fault!
If you care to know I've also mis-labeled MMORE discs here. They are 2x but marked as 4x - even on the disc. So yes such mistakes do happen.