My self-hosted affiliate tracking script is messing up conversion tracking data after recent update!

Hey everyone, my trusty (usually!) self-hosted affiliate tracking script decided to go rogue after the latest update. Now, all my conversion tracking data is showing '0.00' for every single transaction, which is obviously not ideal for commission payouts. It's like it forgot how to count past zero! I've checked the usual suspects, but the log below keeps popping up. Any ideas what could be causing this persistent 'zero' issue? Help a brother out please...

[2023-10-27 14:35:01] ERROR: TrackingService.php - Invalid conversion value detected: 0.00. Expected float > 0.
[2023-10-27 14:35:01] DEBUG: Raw Post Data: {"transaction_id":"TXN12345","amount":"0.00","currency":"USD"}
[2023-10-27 14:35:01] WARN: AffiliatePayoutCalculator.php - Potential data integrity issue. Conversion amount is zero.