Hi @juliana - thanks for your question! My understanding is that you’re seeing a mismatch in AppsFlyer Install events between Amplitude and AppsFlyer.
Here are a few help center articles that I think would be useful to look into:
AppsFlyer: https://help.amplitude.com/hc/en-us/articles/225887508#h_37a9fb90-9a3c-46d5-9015-f9dbc23a9b8d
Troubleshooting missing attribution events: https://help.amplitude.com/hc/en-us/articles/360051234592
To summarize, in order for an AppsFlyer event to show up in Amplitude, there must be a non-attribution event (regular event logged by user) that has a matching Advertising ID already in Amplitude or sent to Amplitude within 72 hours of receiving the AppsFlyer event. Lack of Advertising ID and lack of matching events are the two most common reasons that attribution events do not make it into Amplitude.
Hope this helps! Let me know if you have any questions!