How to fix my LED track lighting that is flickering?
If you look on the box/packaging that the LED bulbs came in, they will tell you the type of switch they require. Some LED bulbs work fine with CFL dimmers (which are the cheaper one's that some manufacturer's will say can dim LEDs) but the majority of 120v LED bulbs require an ELV dimmer. 

Another thing worth noting is that a lot of smart dimming switches are rated for about 150W. Common LED bulb wattage is at around 9W. This means that switch will only support up to 16 bulbs. 

And lastly, if you have any mixed bulb type/vendors on the circuit, it can also cause flickering/conflicts.