The neutrals were all tied together to make one group so it doesnt matter which one makes it to the switch.

Do you tie all neutrals together?

Currently all of the neutral (white) wires coming into the box are connected together (and not to the dimmers). The new dimmers require connections to the neutrals. There are three bundles of wires coming into the box, two of them having their own triads of hot, neutral, and ground.

Do neutral wires need to be connected?

Except in very rare situations, all neutral wires in a box must be connected. The neutral is how the current flows back to the supply, so if you don't connect a neutral to one fitting it won't work. You could connect three in one connector, then three in another, and have a link between the two.