Media Encoder Real-Time changes in my render

I queue up a project with image 1 in the encoder render, then I go back to the project and change it to image 2 while the first video is still rendering. The encoder changes image 1 to image 2 halfway through the first video. The problem is that for the last two years I have been working the same way and nothing changed in the real-time render if I changed something in the project, but now it changes. This has never happened before.