Persistent problem with cookies

In order to see the stats graph, or to see the Welcome username login or log out on the home page I have to delete history/cookies and log in to Gridrepublic again.  This happens several times a day.   Is there a setting I can change to avoid this?  I don't have to do this for any other web sites.  This is happening on my iMac and Macbook running macOS High Sierra 10.13.2 using Safari.  It is also happening on my Lenovo laptop running WIndows 8, Explorer 11 and Firefox.  For some reason this morning deleting history will not even fix the problem on Explorer.  When I refresh the page it refreshes but the tab says Waiting on GridRepublic.  This is getting really annoying!  I have been running boinc for about two weeks now with seti@home and rosetta@home projects and they seem to be running fine but the account managers (including boincStats) are a real hassle.

But the general problem with needing to delete history/cookies every time I view the page still continues.