Version 4 is here - Raspberry Pi Lightning Detector v4.0 - Software / Internet of Things (IoT) Projects - Weather-Watch.com
Rather than trying to debug your v3 problem you’re probably better installing v4 instead and seeing if that works.
Unfortunately I had to use my development RPi for another project so I’ve not been able to look at this for some time. Now that Pi’s are becoming more available I’ll have to buy another one to get it set up again.