Hi, I'm Bhavik. Welcome to JustAnswer. I'm reviewing your question now, and will reply back ASAP.
Please tell me some of them so that I can see if I am able to exess them . Just to make sure this is not website's issue.
Please try below instructions :-
Step 1 :- Choose Safari > Preferences.Click the Privacy icon.Click the Details button.Search for the name or domain of the website whose data you want to remove.In the results list, click the domain (like example.com) that has data you want to remove.Click Remove.When you're finished, click Done and close the preferences window.
Step 2 :-
Choose History > Clear History and Website Data.In the sheet that appears, choose the range of data you want to remove from the Clear pop-up menu.Click Clear History.
After doing both the steps try to vist the website again.