yes
it's because there's more leds in some strands and with another color.
the voltage drop in a led is differnt according to colors.
so to have slightly the same current in the strands with more leds in serie you must have a lower limiting resistor value.
It's not a critical value and check wich led are too powerfull.
Check their ID on the board/schematic and in wich strand they are.
So when you know on wich resistor they are connected, increase it's value to decrease the current in the led.
The rule is to never go under 50 ohms to avoid to kill the leds. In the other way there's no limit and you can go up to 10K ohms without problem (I already used such value with high intensity / efficiency leds).
If you have some electronic skill you can add a 10K potentiometer in serie with the resistor (be aware to keep the resistor in serie) and you turn the potentiometer to reach your "visual value". when it's done, carefullu disconnect the potentiometer and measure it's value.
add this value to the serie resistance and replace the whole value by the nearest E12/E24 serie 1/4W resistor