The message I believe is doing the damage is to be found in
PD16 / "Conversion just conversion Please"
and timed at Feb 11 2018, 18:52 by me.
I cannot find any way to delete a post I made, which probably suggests there isn't a way of deleting ones own posts.
Can you delete the above post I referenced? and or confirm it is corrupting page layout from it onwards?
Regards
Alan Reed