Missing Order Help...

Hi everyone

I have installed my first shop at http://www.rslimitededitions.com and in general it went well (i'm not a programmer).

I have a couple of issues: the first is that I have a large number of MISSING orders in the ORDERS section. What are these and how are they happening (we use PayPal Standard for payments)?

The second issue is that every now and then I get this message from a sale:

P_Standard - Possible Scam: IPN/PDT Price "445.00" does not match OpenCart Total "435.0000". Order needs manual verification

DEBUG POST VARS::mc_gross=445.00
invoice=227 - DAVID HUGHES
protection_eligibility=Partially Eligible - INR Only
address_status=unconfirmed
item_number1=RSLE004
tax=0.00
item_number2=RSLE002
payer_id=M8HGXW86EA4S4
address_street=Flat D, 11/F, 9 Glee Path, Mei Foo Sun Chuen, Mei Foo, Kowloon, Hong Kong
payment_date=08:55:25 Oct 05, 2010 PDT
payment_status=Completed
charset=windows-1252
address_zip=
mc_shipping=70.00
mc_handling=0.00
first_name=DAVID
mc_fee=17.56
address_country_code=HK
address_name=DAVID HUGHES
notify_version=3.0
custom=Z2Np
payer_status=verified
business=info@rslimitededitions.com
address_country=Hong Kong
num_cart_items=2
mc_handling1=0.00
mc_handling2=0.00
address_city=Hong Kong
verify_sign=A9LC3Qajo-H2V8mPq4eIktgPvG2RA1aZ2eQC4Ep.RueetNWCmoSpB-vn
payer_email=dphughes100@hotmail.com
mc_shipping1=60.00
mc_shipping2=0.00
contact_phone=
txn_id=7V5605456U1746050
payment_type=instant
last_name=HUGHES
address_state=
item_name1=Whitesnake HardKase Edition
receiver_email=info@rslimitededitions.com
item_name2=Ronnie James Dio HardKase Edition
payment_fee=
quantity1=1
quantity2=1
receiver_id=EHT5QMSNLXZ44
txn_type=cart
mc_gross_1=285.00
mc_currency=GBP
mc_gross_2=150.00
residence_country=HK
transaction_subject=Z2Np
payment_gross=

This comes through as an email. Does anyone know what is happening?

Kind Regards and thanks for your help?

Cheers

Mark