Strange message about deleting a post

Hi everyone I was loading 6  photos onto a new thread ,when I finished I went into  preview to see if it had gone over OK , It had not, so went back and tried again ,nothing , so I posted it and then thought I would edit the posting ,and then a box came on screen that I had not seen before ,I have not got a clue what it was about!!

it read as follows ,

Since this post is a thread starter,you cannot choose to preserve children posts,If you choose to delete this post ,all children posts will be deleted

DELETE CHILDREN                                        above a tick box

SEND AUTHOR DELETE NOTIFICATION    above a tick

REASON

please provide a reason for why this post or thread is being deleted, This information,as well as who deletes the post, will be logged.Additionaly,an email will be sent to the original post author with the reason  (including who deleted the post).

I tried to cut and paste it from a screen shot but was unable to do that , I have saved the screen shot so I could email it if required 

I cannot understand this as I was the post author!!!! 

Regards Mick

 

 

Work is for those people that don't Bird-watch!!!!