Take a look at the picture. If those boards were warped, then you'd see gaps between the boards and the underlayment above.
Those boards will move with environmental change of every season. They always have and they always will, that's the nature of the animal. Under carpet its no big deal. Under a hardwood floor, it's no big deal. Under a laminate floor, it can be a big deal.
If you look closely at the picture you can see the rough edge of the torn particleboard and the crumbled remnants of the fibers piles up.
Look even closer and you will note that (from left to right) board number 1 is crowned, board number 2 is cupped. Boards 3, 4, and 5 are all crowned.
It will never stop. Just because they aren't reaching up and slapping you in the face doesn't mean they aren't moving and aren't distorted. It happens everywhere. Millions of homes are built with a similar (diagonal) method and the issues exist in each and every one of those millions of homes.
Now is the time to correct the problem for good by getting rid of those unstable slabs of firewood and replacing them with suitable structurally sound plywood that will take the moisture that is rising from under those boards and will be even more trapped when laminate goes down. The ability for the moisture to dissipate will be greatly diminished now that the carpet has been removed.
Trust me Kelebay. This is one (more) time you don't know what you are talking about.