Let me send you a DM to investigate further.
General points of clarification
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If a Google Sheet is synced to projects in 2 different teams, both teams will incur a Sync for every change synced from the Google Sheet to Glide
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When a change is made to an external data source and synced to Glide, that is one Sync. If many rows are changed at one time in an external data source, it can be one Sync if the changes happen quickly together (e.g., I updated 100 rows at once)
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When users in your Glide project add, edit, or delete data in your data source, that is one Add, Edit, or Delete