Issue with Order Confirmation Email - Shows "Array" instead of value/digit "0"

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Hi everyone,

I have set up Prestashop for my store, and everything seems to be working fine right now, except for one major problem:

When a customer places an order, they get the Order Confirmation email. But for some reason, all zero's (0) in the email show up as the word "Array"

So for example if the purchase total is 12.00, it shows as 12.ArrayArray

And even the address, for instance 120 Lucky Street shows as 12Array Lucky Street...

Would anyone be able to help?
No other emails are having this problem - and nothing else on this website has the issue.

Just the Order Confirmation emails.

Thanks in advance for any help!

PS: I have also attached the screenshot of the email that I receive for my test orders

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Anyone have any ideas on this issue?

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Does anyone know at least maybe if I need to hire a Prestashop expert or if this is not a Prestashop-specific issue?

Has anyone seen this before?

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My full email header on that message shows that the PHP-Script was generated by /modules/paypalapi/payment/do.php

Could it be that the PayPal API module is causing this?
Maybe it's somehow incorrectly populating the data for the order?

Any suggestions or ideas from anyone?

Thanks