Bat icon is not works correctly

When I open the brave browser on my phone, click on the Bat icon and things like the picture appear. When you quickly click on the bat icon in a row, these are more pronounced like bugs.
look at the behind purple area. !
Screenshot_20191125-062121|250x500


Can you please add the device details? I can’t reproduce the issue

gm 8
Android 8.1 Oreo
peocessor : Qualcomm MSM8940 Snapdragon 435
3 gb ram.

does it stay like that even if you just click on the bat icon once?

if you click it repeatedly it shows like it… black bar , blue bar copeid etc