CRM 2016 (on prem) - Error in claculating Goals

It was reported to us that there was a miscalculation in our Goals, and after further investigation, some of the goals were automatically adding additional values.

Issue was resolved whe a new replacement goal was created.

Any idea what could be the cause of this? I've been working with goals since 2017 and this is the first time I come across such an issue.

Find below for your reference: