Thank you guys...
I think at some point during the camera's retraction, before I tried to close it and realized it wasn't fully closing, something happened—I'm not sure. I tried to be careful, but I wasn't really. Finally, what I tried was removing the ground glass and gently pushing it in the same direction as the front part. I was able to confirm that one of the clamps (the one on the right) was rubbing during some part of its movement. I greased the entire area and tried to smooth its movement, which caused friction on the internal support at the front of the camera.
Then I realized how silly I'd been, because when retracting the camera to close it, I had set the waist level the same way as on my Maximar, and this camera is a bit smaller, so the waist level in the closed position should remain turned to the left. This happened because I was careless and didn't register it when I first opened it.
Also, unlike the Maximar, the bellows body of this camera disconnects from the rail when it's in the retracted position, like my Busch & Pressman. In short, minor design details.
... the truth is that this camera came with 7 plate holders at a good price that I couldn't pass up, and that's what I was really looking for. Now with 14 plate holders, I think I might be able to work a little more comfortably. I also love the idea of being able to take 18 x 24 x-rays without wasting absolutely any of the sheet