I have encountered this floating error when combining mods K2+SE+combat mechnic overhaul.
I fixed this error after I selected "restore default settings" and selected the old settings again. Try this way.
Also, it would help me if I could get an archive of the mods folder (archve it completely, along with the settings)
upd: I think I found a way to reproduce the error. This is setting "Optimization: Remove blood particles (Reduces lag spikes)"
I will make version 1.2.1 soon.
While I'm looking for why it broke, I recommend returning the setting "Optimization: Remove blood particles (Reduces lag spikes)" to the default value.