It works but not always. I have the cooldown set to 2. It still will pull an item here or there, especially coming out of an item router.

Does this happen at the time when the items are placed by the item router onto the conveyor? This could be a bug in Immersive Engineering, as the IE conveyors already block magnets themselves and this mod does not change them.

Try placing a Demagnetizer near (within 4 blocks of) the item router. If it still picks up items after the Demagnetizer is placed, that could be a bigger problem.

It seems so, but I tried an EnderIO magnet and it did not have the issue. I will test what you suggested and let you know the results.