Emails from whitelisted domain going to Spam

Emails from whitelisted domain going to Spam

Hi.

I have had several emails that quite often go to Spam folder even though they are whitelisted domains.
The most prevalent are the following 3


savingstar.com
swanson-vitamins.com
grabagun.com

I have added these domains to my whitelisted domains, but everyday I receive emails from them and they 
go to my Spam folder. There has been others, but lately they have been coming to my Inbox folder.

I have been receiving emails from these domains for years now and it is only in  the last several months
that I have seen this start happening. It used to be a lot more, but when I selected a message in my 
Spam folder and clicked "Not Spam" it seemed to take care of many of them, but these 3 especially 
never seemed to go to my Inbox, so I added them to my whitelisted domains and yet they still end up
in Spam every day.

Please help me sort this out.

Thanks,
/Brett