We have a strange problem with our site.
Recently we have noticed orders coming in with no VAT added to the order, but the payment that arrived had the correct amount we would expect if the VAT was added.
I did a few test test orders and during the order process it did not show any VAT, but in the paypal payment screen it showed the VAT.
Also we have another problem that does not sound related, but happened at the same time.
When we log in and click on the sales tab, i can see that there are orders in pending, but when i click on the pending link to see what the orders are, they dont show, and if i search for an order by the order number i can find it and it says it is in pending, and if i move it to processing, the number of orders in processing goes up one, but if i click on the processing link i cant see it.
I have taken some screenshots and put them together, showing the two different views of the pending folder, one shows there are three orders in pending, and when you look in pending, it shows the last order that was in pending before the problem started.There is also a shot of a test order showing without the VAT.
As a temporary fix we have changed the prices to include VAT.
Nothing has changed on the website and is 2.5.1 from upgrades that went without a hitch.
The only think that has changed was we started to use exchange 365 and around the time this started to happen the MX records were changed on the domain.
I am not sure if the MX records change are the cause of the problem, but any help would be great.