Took me 3 days to realize my invoice system was double counting labor

We got a new commercial account in Denver last month, big office move. I set up what I thought was a clear billing structure: hourly rate plus a flat fee for packing materials. After the first week I sent an invoice and the client immediately called asking why it was 40% higher than the estimate. I spent 2 days going back through my spreadsheet and the original quote, finally on day 3 I saw it. I had the hourly labor schedule set to auto-calc into the materials line too. So every hour was getting billed twice. Felt like an idiot, but the real kicker is the client was cool about it, just wanted me to fix it. Now I triple check every invoice before it goes out, but I still worry about what else I'm missing. Anyone else ever had a billing error that took you way too long to catch?

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