Paypal Payment But No Order

Hi,
We sometimes have a problem where we receive a payment from Paypal but no order confirmation from Sytist they seem to be stuck in checkout. It seems to have increased since we changed to Paypal Checkout.
I'm unsure whether the problem is with Sytist, our host or Paypal. Are you able to point me in the right direction?
Thank you!

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See this:
https://www.picturespro.com/sytist-manual/common-issues/customer-paid-by-paypal-but-no-order-created/

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I typed a reply, but it disappeared, hopefully it won't pop up twice:
(I posted the question above while I was logged in with Kerry's account)

I will work my way through that list to sort out where the problem is, thank you!
Just having a little trouble finding this: 1) In your Sytist admin click Settings in the main menu. Then underneath the left menu click edit .htaccess file.
Has this moved since that post was published? having trouble finding it.

Thank you!

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It should be here if you do not have any other host issues.

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Same spot as the above screenshot but edit config file instead of .htaccess file.

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