I am the website owner for https://uvsultra.online and one of my users has reported to me that their Malwarebytes Browser Guard recently began blocking site navigation as of sometime yesterday it seems. Thye provided me with these screen shots of the issue indicated.
Nothing was updated to change the behavior of the site in the last few days and I have no indications of the site being compromised and it isn't flagged by other services as insecure or dangerous. If there is some behavior that is being flagged that needs to be corrected to resolve this please let me know but otherwise I just think this is being needlessly/improperly black listed perhaps due to the ".online" address maybe.