First rule of home automation: “the model number matters.” Zemismart sells a lot of different devices. Which ones specifically? At the very least, are they zwave or Zigbee, because if they are Zigbee, they may well be some of those cheap Tuya switches I mentioned. 
The following thread discusses the same problem. The solutions given there won’t work specifically for you, because they depend on the old architecture, but the idea is the same: you would have to find someone who has written an edge driver that will debounce the switch. It’s not impossible, but it’s not that easy either, and it’s just an issue with those particular models and the way the manufacturer designed them.