Why is this TCP SYN/ACK packet malformed?

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So I've been trying to make a TCP-Stack in VHDL but I've run into the problem that the SYN/ACK packet I'm sending for the initial handshake is malformed according to Wireshark and I can't seem to figure out why.

I've uploaded the wireshark file to my dropbox:

https://www.dropbox.com/s/ggvfmb442i0...

It's packet No. 15.

There must be some error in how the packet is put together since Wireshark says it's not a full TCP-Header even though all the data is there.

Any help would be much appreciated.