NodeMCU - Master and UNO - Slaves (I2C communication)

And the output of the Master Serial Monitor of my project is as follows

13:12:41.949 -> CO2 HUM 2: 0.00
13:12:41.949 -> Pressure 2: 0.00
13:12:43.346 -> Value Uploaded Successfully
13:12:43.346 -> Co2 = 0.00
13:12:43.346 -> 
13:12:43.346 -> 
13:12:43.630 -> Value Uploaded Successfully
13:12:43.630 -> Co2 humidity = 0.00
13:12:43.630 -> 
13:12:43.630 -> 
13:12:44.145 -> Value Uploaded Successfully
13:12:44.145 -> Co2 temp = 0.00
13:12:44.145 -> 
13:12:44.145 -> 
13:12:44.520 -> Value Uploaded Successfully
13:12:44.520 -> hPa = 0.00
13:12:44.520 -> 
13:12:44.520 -> 
13:12:45.545 -> Recieving float as String...
13:12:45.545 -> 
13:12:45.545 -> Reactor 1 Sensors: 
13:12:45.545 -> Pressure 1: 
13:12:45.545 -> 
13:12:45.545 -> Converting string to float...
13:12:45.545 -> 
13:12:45.545 -> CO2 PPM 1: 0.00
13:12:45.545 -> CO2 TEMP 1: 0.00
13:12:45.545 -> CO2 HUM 1: 0.00
13:12:45.545 -> Pressure 1: 0.00
13:12:46.842 -> Value Uploaded Successfully
13:12:46.842 -> Co2 = 0.00
13:12:46.842 -> 
13:12:46.842 -> 
13:12:47.401 -> Value Uploaded Successfully
13:12:47.401 -> Co2 humidity = 0.00
13:12:47.401 -> 
13:12:47.401 -> 
13:12:47.680 -> Value Uploaded Successfully
13:12:47.680 -> Co2 temp = 0.00
13:12:47.680 -> 
13:12:47.680 -> 
13:12:48.005 -> Value Uploaded Successfully
13:12:48.005 -> hPa = 0.00
13:12:48.005 -> 
13:12:48.005 -> 
13:12:48.005 -> Recieving float as String...
13:12:48.005 -> 
13:12:48.005 -> Reactor 2 Sensors: 

Getting all 0 values if both the slaves are connected. But getting the desired values if only one slave is connected.