OK, so you are using direct pin control, not virtual pins… Yes it can work, but not as good as proper code and digital pin commands in my opinion.
I couldn’t tell that your sliders and zeRGA were separate as it looked like they were getting feedback with each other… but that could have been due to recent changes with shared pins (assuming digital pins are included in that) thus it had similarities to some of my example code, so your statement of using BlynkBlink wasn’t enough to make me sure 
Try it out…
Possibly due to the default range settings in the zeRGBa… try switching them back to 0-255
PS, Best to use a proper GND pin and be aware that D8 has a built in 10K PD resistor on the Wemos D1 Mini