Why are there ESTABLISHED packets without preceding SYN_SENT or SYN_RECV

I open two side to side bash widnows one with : netstat -anutpc | grep ESTABLISHED | grep kde the other with netstat -anutpc | grep -e SYN_SENT -e SYN_RECV, I start konqueror and go on youtube.

I got two IP to which my computer sent SYN_SENT (no SYN_RECV) but I got some IP in the ESTABLISHED monitoring window that don't have their counterpart in the other bash.

I'm just trying to understand how this whole thing work, could you explain why there are packets part of an ESTABLISHED connection that were never initiated ? I think closing konqueror for more than 2 minutes should close all the connections associated with the software, so if I reopen it 2 minutes after it should resend all the SYN packets.

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