Have you solved this problem? I'm getting the same error.Excuse me for the question, I have tried to install the last two versions .11 and .12 that you have shared, tried it on domain and subdomain, cleared all cache histories, tried various things and in different ways. in localhost everything is fine, but in a domain or subdomain I get this problem, numbers and letters are automatically added next to the URL, I tried different versions of wordpress and the same thing keeps happening several times, why is it or how to solve it