[fritsch]

21:41:29.091 T:140295208481920 INFO: ID:0x1eb Name:1920x1080 Refresh:23.975760 Width:1920 Height:1080
21:41:29.091 T:140295208481920 INFO: ID:0x1f0 Name:1920x1080 Refresh:23.970909 Width:1920 Height:1080

See I colored yours in red. It's just not exact enough: 24 * 1000 / 1001 = 23.97602 ... 23.970 is not a really good match, but to be honest: I have seen worse :-)

Edit: I talked to lrusak, we will change the max allowed difference to 0.01 instead of 0.005 - then your red mode will switch too, but never the lese - the mode line I gave you is way more exact.
Edit 2: You become famous: https://github.com/xbmc/xbmc/pull/13908