Weird Sound Effect after Rendering

Hey guys!

So I recently upload videos on my channel and when there is a cut or transition between parts, it sounds super weird, I only applied the "Denoiser" to reduce the noise in the background and used nothing else.

The video: https://www.youtube.com/watch?v=NlLy-u61yyk - you can hear it around 26:33....can anyone explain why that happens and if there is a "better" filter for that? Would you recommend something like the multiband compressor?

Every help is very much appreciated!