Objective froze at 105/140, suddenly Complete notification appeared, I checked and claimed rewards, objective is done but objective counter is not working.

I've seen something similar once. I think the objective manager got stuck in a bad state.

What modloader are you using? Is this the latest build?

latest.log
Didn't see anything from Wynntils relating to the Objectives but worth uploading.

This is 1.18.2 Wynntils build 283

#407 should have fixed this. Reopen if it occurs again