PHPphp mysqli affected rows returns 0 when it should return a positive integer

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Introduction

This script is designed to handle reporting devices (IoT), when a device is not previously authorized (in the devices table in the database), I add the new device to a new_devices table. I run an update query, and if affected_rows returns < 1, I insert.

When I have a new device report, the first time $stmt->affected_rows runs it returns 0, subsequent communication returns 1, then 1, 0, 2, 2, 2, 0, 3, 3, 3, 3, 3, 3, 0, 4, 0, 0, 6, 6, 6, etc

It's as if the update statement is failing. Why?

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PHP's $stmt->affected_rows intermittently returning 0 when it should return a positive integer