When working on the SBS online site, Kaspersky blocks the plugin, why?

Question

Antivirus

Domain environment, user's Casper version 10.2.5, WS7 x64.
We go to SbisOnline to confirm accounts, as soon as it comes to confirming an account through an EDS, a notification pops up on the site, make sure that SbisPlugin is installed and an EDS is connected.
As soon as we disable Casper's Web Anti-Virus, we update the page, the plugin works and everything beautiful is signed.
I added traffic from Sbis to the exceptions
. I also added the plug-in itself to the main protection parameters.

Nothing helped, everything is still blocked.