[SOLVED] Duplicated items in cart

/edit: As sw!tch mentioned, there's a thread where you can find a possible fix for this. I already applied it but I wasn't able to reproduce this bug in order to check if it was indeed fixed or not.
Head to and see for yourselves: viewtopic.php?t=211273

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What's up guys?

Some customers are reporting a really frequent issue that involves duplicated items in the cart right before checking out. Some didn't even notice this and checked out with duplicated items so I had to modify their orders because the total was wrong, logically.

In order to solve this I should apply a "process of elimination" and discard from A to Z possible solutions/errors. Thing is, I don't even have a clue where to start.
Every file I modified it's recorded so I can replace them with the default one in case of bugs, should I start by replacing those files? Maybe the cart.twig/php files? That's where the issue begins. Or maybe the checkout file?

- OC version: 3.0.3.6
- My website: https://nomadebaker.com/
- My theme: https://themeforest.net/item/fortsi-ope ... e/23551830

Thanks for any insight

An insight on what ? You mentioned neither OC Version, nor the Theme used,
and that, by beeing around OC for quite a while already ...

It is not happening with default - your logic is correct.

There are two ways to consider it
1. Your way going backwards - yes cart, checkout would be a logical place to start - (and I have just remembered your OC and theme - your theme is probably a good place to start actually)
2. Disable all and enable one by one. If you can and that is not always possible, but you might find this quicker.

See here - viewtopic.php?t=211273

sw!tch wrote: ↑

Sat Oct 17, 2020 1:30 am

See here - viewtopic.php?t=211273

to all - apologies
and it still does the same on 3.0.3.6

sw!tch wrote: ↑

Sat Oct 17, 2020 1:30 am

See here - viewtopic.php?t=211273

Completely missed that thread. I've been looking like crazy everywhere and couldn't find anything related to that. I hope it's the same issue, I applied those fix and I'll wait till customers report it again (or not). Thanks a lot!