Dahua/ EmpireTech fit privacy masks tight to screen edge

[Schuft]

Hey guys,
II have serveral EmpireTech IPC-T54IR-AS-S3 with privacy masks all over.
I am unable to allign them to the edges of the screen without leaving thin unmasked areas which do not look good (see example below)
Do you found a solution to set them tight to the edge?

 

[bigredfish]

What is outputting rounded edges on the images?

How/where are you drawing the blocks? On the camera GUI itself not the NVR interface I hope.

No, I have no problem making the block go all the way to the edges

 

[Schuft]

pls ignore the rounded edges - they are from frigate.

Here's a picture (at daytime) without.

I draw the masks via the web-interface (no NVR/no additional software) using Firefox and Chrome. On both a can't manage to draw them to the edge.
Once I try to place the edge of the blocks near the edge of the frame the cursor is just dropped (not easy to explain from non native speaker like me )

 

[bigredfish]

Odd

I would try using MS Edge or Edge in IE mode. It sounds like a browser issue