user of recent comments has changed

I see a strange behavior on recent comments widget. When I select comment of an user, all comments on widget has changed to selected comment user.
If I deactivate Ultimate Member plugin, all is ok. Where can I find this problem?
Thanks.
Capture Recent Comments – before select
Capture Recent Comments – after select

• This topic was modified 8 years, 2 months ago by dcrst75.
• This topic was modified 8 years, 2 months ago by dcrst75.
• This topic was modified 8 years, 2 months ago by dcrst75.
• This topic was modified 8 years, 2 months ago by dcrst75.