Pip confusion advice needed

Hi, I put in a mandatory reconsideration a month a go with regards to the decision given. I haven't heard anything about this as yet. Today I received a new PIP claim form from DWP to be returned by 28th May saying thank you for telling us your needs have changed! I haven't said my needs have changed since the last review. Why have I been asked to fill out another form? Is this a new part of the appeals process now? Has anyone else had this? It is causing immense stress and don't think I have the strength left in me to deal with them anymore. I am still trying to recover from the assessment and appeals process. Any advice gratefully received. Thank you