Post production problem in FCPX when recording in slow motion mode on Canon C100 Mark II

I'm using the slow motion mode on the EOS C100 Mark II- (I've referred to the manual). On the OLED display the shooting frame rate is displayed as 59.94P and the playback frame rate is displayed as 23.98P and S&F is displayed at the top. However when I then download the file onto my MAC and open it in FCPX (Version 10.3.4) and I check the details of the file from the browser window using the inspector panel the frame rate is 23.98P. I've tried downloading the file using a memory card reader, I've tried using the Data Import Utility and had the camera connected directly to the MAC, I've tried importing it directly into FCPX from the camera - all with the same results.- I'm checking it in FCPX . I'm just wanting to be able to use the clip as it has been shot i.e. 59.94P. I'm using a Mac Pro and the Operating System is macOS High Sierra Version 10.13.1. Any ideas on what I'm doing wrong?