Can’t stay logged in

So I’ve had issues with this site forever. I login and the website redirects to my profile but as soon as I leave that page I am logged out. I get stuck in this perpetual loop of logging in. I have cleared ALL of my browsing data and tried multiple browsers on multiple desktops. Somehow I am able to login using safari on my phone. I even tried resetting my password but when I use the new password on my phone the site doesn’t recognize it. I’m still able to use my old password on my phone. This is an ongoing issue for me and why I generally don’t use the site. But I like to sell gear here and would like to resolve this issue if possible.
Thanks!