Activity focus does not change to activity being selected in P6 Pro 20.12

Has anyone run into this problem where the user has selected a different activity from the one they were working on, as evidenced by the highlight (as opposed to the user believing they had because they were looking at the activity they wanted), however the focus of P6 remains on the previous activity they were working on?

User reports that she had was editing Activity 1400 and then selected Activity 1020 to edit it. Activity 1020 is highlighted in blue in the screen capture she sent. And she starts to edit what she believes is Activity 1020, however her edits in the activity columns in the table are being applied to the previously selected activity, 1400, which is still the focus as seen in the Activity details at the bottom of the screen in the capture. The environment is P6 Professional 20.12 hosted and accessed via Citrix.