Express Checkout payment module

[DrByte]

IPN ERROR :: Could not find stored session
{05fda2a2b64bc03b5d485a0457788bb4} in DB; thus cannot validate or re-create
session as a transaction awaiting PayPal Website Payments Standard
confirmation initiated by this store. Might be an Express Checkout or eBay
transaction or some other action that triggers PayPal IPN notifications.
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IPN ERROR :: No saved Website Payments Standard session data available. Must
be an Express Checkout or Direct Pay transaction.
Could be a test notification, or the incoming IPN notification is not
actually a bonafide PayPal transaction.
NOTE: It is likely that all the following log content is meaningless or
irrelevant.
----
IPN ERROR :: No pending Website Payments Standard session data available.##
Might be a duplicate transaction already entered via PDT.
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I am wanting to know if you can see what has gone wrong with this order so it doesn't create?

Hard to tell. The log is saying exactly why it didn't store the order: it couldn't find any customer's checkout that was sent to PayPal and still waiting for an IPN to be matched up to it. Thus it has nothing it needs to do.
If that is happening to you on EVERY order, then yes you've got something wrong with your system, or you're purging the stored paypal-sessions data which it uses to do matching (you'd have to do that by manually editing data in phpMyAdmin, or by using an addon that purges that info).

Second problem:
As I said before when I switched to express the line numbers didn't show, you mentioned discounts cause this, does that include sale items? I ask because I noticed in payment standard that when a coupon is applied the total is consolidated but not with sales, does express do the same with sales too?

No, a "sale" shouldn't operate any differently in EC vs IPN.