In general, CSRF errors typically occur when a website cannot verify that a request is from a legitimate user. This can be caused by issues like ad-blockers, disabled cookies, browser extensions, etc.
I'd check that you are not blocking cookies for the website and if not, then disable all ad-blockers or browser extensions you may have installed and re-enable one-by-one to see if any specific one is causing this.
Also, ensuring you have a valid signed SSL certificate (not self-signed) helps to avoid these errors.