Debt Strategies not following correct order

Summary:

Our debt strategies seem to have taken on a mind of its own and they are moving on to the next step when the preious step isn't complete, as well as duplicating steps at random and adding them in. This is causing our customers to receive multiple letters or letters out of sequence.

Content (please ensure you mask any confidential information):

Has anyone else faced this issue where the debt strategies have 2 or more open tasks at once when there should only be one? Or the tasks are duplicating and sending out multiple letters? This is happening across all our debt strategies and affecting customers at random.