Hey @David Ribalta ! The seat limit counts currently active seats (users + machine identities), not lifetime unique accounts. A few things that could be causing this:
1. Machine identities count toward the 5-seat limit too. If you have any, those eat into your seats.
2. If the person you removed already had an Infisical account, they may still show as counting if there's a pending/stale invitation record.
Could you please check how many machine identities you have in the org? If that's not it, let me know.