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I am having an issue with some cards showing as red in the decklist view for a deck that I imported from my Dropbox account as a .dec file.

The deck is set, and built, as a Vintage deck and things like Mana Confluence and Serum Powder show up red for some reason. There are more cards which do this, about 10ish in total out of 75.

Can someone explain what this means, and if it is due to a bug or problem, then explain how to fix it? Thanks! :)

[Trade Binder]

Trade Binder

Needed

1x {Adarkar Wastes} [ia]
1x {Arid Mesa} [zen]
1x {Brushland} [ia]
1x {Dark Confidant} [rav]
1x {Goblin Guide} [zen]
1x {Godless Shrine} [gtc]
1x {Gurmag Angler} [frf]
1x {Hallowed Fountain} [rtr]
1x {Karplusan Forest} [ia]
1x {Misty Rainforest} [zen]
1x {Rakdos Charm} [rtr]
1x {Scalding Tarn} [zen]
1x {Snapcaster Mage} [isd]
1x {Spell Pierce} [zen]
1x {Sulfurous Springs} [ia]
1x {Tarmogoyf} [fut]
1x {Thought Scour} [dka]
1x {Thoughtseize} [lw]
1x {Tombstalker} [fut]
1x {Underground River} [ia]
1x {Verdant Catacombs} [zen]
1x {Watery Grave} [gtc]
1x {Windswept Heath} [ktk]
1x {Young Pyromancer} [m14]