Reduce/remove popcorn effect

In my living room I am using the following devices:

(2) TP-link WiFi LB230
(2) TP-link WiFi LB130
(1) KOF Zigbee Fan/Light module

It takes a total of 3 seconds before all five lights are turned on/off. And they seem to go in a sequence verses all turning on at the same time (or close to same time).

I thought this could be due to cloud but I am seeing this in my Zwave switches for a specific room too.

I have tried scenes and groups but nothing seems to resolve the issue. Suggestions?