Hi, yes of course. 

This is the workflow - I need to be careful with what I show as this is within my companies service now instance. I have circled within the picture where I think the issue lies. The first approver triggers no problem and works fine, when I change the state to Pending Second Approval, the workflow automatically cancels and nothing else triggers. I have no custom scripts within the workflow either. Not sure this is entirely relevant but the starting workflow conditions is State > Pending Approval and "Run the workflow always". The state default view is pending approval so that the approvals always trigger for new records.  

If you need anymore info, please let me know and thank you so much for your help!