Should Identity Safe be able to log me into this Forum?

This is the third weird thing today so here I go:

 

If I come here via a link in an email notifying me when someone has replied to a thread, the log-in boxes are on that page and the Identity Safe logs me in - no problems.

 

But if I come here via my main link and click on log in (or sign in) the two boes appear in a new window and Identity Safe doesn't log me in - I have to do it manually.

 

Is this normal, please?