Scrambled display


I am using a wireless link via 2 X Ubiquiti NanoStation Loco M5.

We access the management screen of the device via the local IP address. With BitDefender free, every browser (i.e., chrome, edge, firefox...) display a scrambled screen. Turning off BitDefender Free, and rebooting, all the browsers displays the screen correctly.

I tried the 30 days free trial of BitDefender Total Solution, and it does not have the problem.....

Any idea/suggestion?

Thanks in advance