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It sounds like you’re experiencing some interesting quirks while setting up Google Analytics 4 (GA4) on your website. It’s normal to see (not set) values when dealing with custom dimensions. This usually indicates that the parameter you’re trying to pull the value from wasn’t set when the event was triggered. With “session_start” and “first_visit” events, it’s possible these aren’t properly connected to your “page_view” events, which might explain why your total session counts are off. As for the doubling of parameters, GA4 counts events differently than previous versions and will track multiple parameters in a single session separately.
Remember that when running GA4 parallel with analytics.js, keep a close eye on your configurations to not overlap or interfere with each other. And as always, dive deep into the data, filter, and examine various possibilities to root out the cause of these discrepancies. Your code implementation also plays a key role, so a double-check never hurts. With GA4, the learning curve is steep, but it’s a powerful tool once mastered.
