Comprehensive Stopwatch & Countdown Timer

OBS Lua Comprehensive Stopwatch & Countdown Timer Relinked

I've successfully installed the plugin and have Start/Pause and Reset hotkeys working. I cannot get the Add Second or Subtract Second hotkeys to work. I'd also like to know what the hotkeys "Add/Subtract Seconds Set 1/2/3 [Timer name]" are? Why are there 3 options here? Any help would be appreciated.
 
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