Although Product has enough Quantity, Checkout displays OUT OF STOCK message

Hello,

I run Opencart 2.3.0.2 on Journal 2.8.8 and a few plugins from iSenseLabs and others.
Although there are enough items per product in stock, when the client finishes the order OC claims that the product has not enough items.

I have performed a few demo orders logged in as the complaining clients and I could not reproduce the issue, if there's any.
I wish to investigate more.

Please advise

If you can't replicate a problem it's almost impossible to fix it.

Perhaps you can ask those clients to share screen or send you a video of the issue occurring?

Will do! Thank you