Describe the bug
Reverse range check shows check distance truncated so 10y or 15y become just R-Range Check (1...

Screenshots
Example from Jaina encounter:

Did you try having DeadlyBossMods as the only enabled addon and everything else (especially something like ElvUI) disabled?
No.

Which version of DeadlyBossMods are you using?
aefcde0

Was it working in a previous version? If yes, which was the last good one?
Probably? There were changes to it not long ago.