Inspection settings TCP related

[ED]

Hi everyone,

R80.30 environment. Firewall is set to drop out of state TCP packets. 

I see a lot of logs for TCP related packets. For these:

Manage & settings -> Blades -> General -> Inspection settings -> filter for tcp

Like these logs:

Name: Streaming Engine: TCP Invalid Checksum

Information: Invalid checksum. Packet dropped.

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Name: Streaming Engine: TCP Segment Limit Enforcement

Information: TCP segment out of maximum allowed sequence. Packet dropped.

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Name: Streaming Engine: TCP Invalid Retransmission

Information: Invalid segment retransmission. Packet dropped.

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Name: Streaming Engine: TCP anomaly detected

Information: Non-compliant TCP packets coming from multiple external sources were detected. This may result from potential network configuration problem

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Could someone care to explain me what the underlying problem might be here overall? What to troubleshoot?