Redstone not being able to place on certain blocks

I was building a cool survival base and setting up a redstone door when I realized that I couldn’t place a block of redstone in one spot. I was in a swamp, not a mangrove swamp when this happened. I didn’t do the best job of explaining this so I attached a video. I would give a longer video with more detail, but it says that the files size is too big. Please increase that for future references. You may have to slow the video.