The free version of Resolve is limited in various ways, so that you would have a reason to buy the Studio version. One limitation is that it doesn't support advanced codecs, like the 10-bit video your camera is probably recording.
Various things you could try:
- set your camera to record 8-bit
- transcode your video to 8-bit, for example using Handbrake
- buy Resolve Stiudio
Which you do is up to you. For people doing advanced video, buying a full video editor (like Resolve Studio or Premiere Pro) would be considered pretty basic. If you're not doing serious video, then 8-bit should be fine.
