Fake cinematics shots HELP

I’m making my first cinematics and I have a problem that I don’t understand and it’s taking my life away. I set up the sequences and check with the Viewport of the camera that the shot is as I want, everything is correct. However, when I render the video in AVI I always get strange camera shots that I have not set at any time. I intend to make a single fixed shot. So it doesn’t make sense that there are cuts. I have checked a thousand times that there is no keyframe in the camera location, according to the viewport everything is as I want, but once I render…

I’m so tired. I don’t understand it. Please, help.