Order issue investigation

I’ve checked that order mentioned in the Basecamp thread, and yes, I found that it's an existing customer order.
I still don’t know how that order passed all the condition
Currently, I’ve fixed that particular order; I’ll look tomorrow for the reason and fix it by tomorrow

Your response is clear and to the point, but you might want to make it a bit more structured for better readability. Here's a refined version:

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"I've checked the order mentioned in the Basecamp thread, and it is indeed from an existing customer. However, I’m still unsure how it bypassed all the conditions.

For now, I’ve fixed this specific order. Tomorrow, I’ll investigate the root cause and implement a proper fix."

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This version makes it slightly more polished while keeping your message concise and professional. Let me know if you'd like any further tweaks!