Firstly I need to confirm on which platform your website is made can you confirm that?
also, you can try adding custom SSL to your account check here
If these steps doesn’t work for you i suggest try reaching out to HubSpot support regading this issue
Let me know if you have any follow-up questions.
If my post was helpful in addressing your query, Support the community by indicating it as the solution.
Unfortunately that is not included in the free plan. So the issue will have to be fixed with the tools that I have at hand. This solution also seems like it would patch the issue, but not fix it.