I applied for two streams. One is English IG and the other is French IG. I did the second one as a backup because I found a mistake on Schedule A in the first one.
I took the screenshot for the both. This is what I experienced:
Google incognito and Microsoft Edge on my PC, without VPN, did not show the site and it was just white.
Cellphone A: The site let me log in with an email account for English application, but it showed as "wrong email address" when I entered an email address for French application, though I tried to log in for French after logging out from English one.
Cellphone B: The site let me log in with an email account for French application.
I used 3 devices just to take two screenshots. I am not sure if the applicants who got refusal due to a wrong stream really chose the right one, but I would say that the IRCC system has lots of problems.