Resolve (and pretty much all other NLEs) won’t change the clip speed depending on the timeline. I think we have talked about this before but this is what’s happening:
If you, for example, had 50fps footage and you’re cutting that into a 25fps timeline then the program will drop every other frame. This is to keep it at the same duration. So if you want to cut in a second of 50fps footage it won’t turn into two seconds of 25fps footage when you insert it.
So in a timeline your 60fps footage is dropping a bunch of frames with a certain cadence to run it in 24fps with the same duration. If you want to run it in slow motion you can change the clip to run at 24fps in the clip attributes or slow it down in the timeline.