Excessive TCP retransmissions, Dup acks and out-of-order

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Maybe this is not entirely wireshark related but I think this is the right place to get an answer to this. I started wireshark and visited 2 or 3 websites, did a speedtest and i was very surprised by a lot of TCP retransmissions, TCP Dup acks and TCP out-of-orders on 5ghz wifi connection. Decided to give a try to the congested 2.4ghz and unsurprisingly, i got the same results.

I know 802.11 contemplates L2 retries, i did not know that it can spread to upper layers and affect TCP.

Is this a normal behavior of wireless connections or am i just in a bad luck and having interference ?

Setup: macbook pro 2013