send form problem

I have a problem with two of my websites.
I get blanco messages to the recipient mail-address although I have Validated fields. Can anybody help me out how to protect my contact forms from being hacked. Clients think they are missing orders but I am sure this is a spam/hack problem. The only thing this received in the mailbox is the topic (contact/order via website) that I have preset.

Pls help…


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