Welcome to the Community!
This is a very frustrating issue! I can’t see your system, but here are a few things to check:
- Is there another user that is logged in with your account? It could be that they are marking those tasks as completed without knowing what they are doing.
- It’s always a good idea to clear out your cache or try a different browser to rule out a UI glitch. HubSpot is stable but sometimes browser extensions or cookies could cause weird behavior.
- Do you have the mobile app downloaded? It could be possible that there are a few that are being marked as completed on accident. This is less likely if you are experiencing a high volume of issues.
- You could set up your task filters to show “due today” or “over due” to possibly prevent more tasks being completed prematurely.
Unfortunately with the free plan, you aren’t able to see acitivity logs, however if you ever do upgrade to Sales Hub Starter or Pro then you’ll be able to see the history and attribution.
I’d be interested to hear if any of these are a solution to your frustrating issue.
Happy to help however I can!