I have made a partial fix for this in v.116 ( 
Bug) which will reset the accumulator to zero when this happens, so from that point onward it will ‘sync up’ correctly. However, this is treating the symptom rather than the cause. The most likely cause I can think of is that one of the enemies’ heath is incorrectly replicated. That is, something similar to…
… but for another enemy. If you have noticed this bug happens after killing a particular kind of enemy, please let me know which enemy immediately.