- wp super cache
I have encountered this sort of problem before. It is caused by woocommerce, particularly the setting "geolocalize users with cache support" which adds this parameter to every single url and link. As you may have noticed, the hash appended would be the same in every browser and url on your computer.
Hence, it was not a "session" hash, but an IP address hash.
To clear this simply log in to your admin dashboard, and under "woocommerce->Settings->General->Default Customer Location", pick the third option, which is IP without cache.That is 'Geolocalize'.
That solves the problem.
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