Blue Iris

Hi all - I'm a new Blue Iris user. I've added my cameras and can view them all. However, some of them have an odd green border around them and are sized slightly differently. I have seven cameras in total. Three have this border, four do not. I've compared all the camera settings as best I can and the settings appear to be identical between them. All the camera models are identical. Clearly there's something I'm missing. Any help would be appreciated. Thanks in advance!

The only mention of a green border I can find in the BI manual is this, on page 68:

"More-so for analog cameras which may display a green or blue frame when there’s no signal, the option exists to interpret that as a signal loss."

That seems like an unlikely issue since the cameras are all working, so maybe it's time to query support to find out what's going on.