Since the click ID acts as the primary key for tracking, both subIDs may be grouped under a single click event, depending on how BMF.io resolves collisions. In some cases, the system overwrites one subID with the latest received value, while in others it aggregates them, which can blur source-level accuracy. This makes reporting tricky because downstream analytics might attribute conversions incorrectly or double-count engagement signals. It also reduces granularity for optimization, since you can't clearly separate which subID drove the action.