Nintex Tasks Disappear

We use Nintex Workflow to create tasks as part of a change process that required signoff by multiple parties and this is then reflected in the form via a "list view" control that shows the outcome and comments.


For the most part this work fine, however some of the tasks seem to disappear and therefor the list view control appears empty even though the tasks have been completed. We can review the comments in the workflow history however this is a very cumbersome way of reviewing the comments. 


Firstly, is there any explanation as to why this might be happening?


Secondly, is there a way to stop it from happening? 


Thank you in advance for your help.

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