www.vestmap.com (I own it!)
edit: reproduced on chrome by setting: Network Conditions > User Agent to Safari - iPhone iOS 13.2 and Dimensions iPhone X Looks like it sets the cookie `_p` to 1
edit: I believe this is the offending file (line 4349 at the time of writing this) https://www.vestmap.com/wp-includes/js/jquery/jquery.min.js?...