This has just appeared on one page in my RW8/Stacks4/Foundation2 site and I cannot see the controls to switch it off when not wanted! (shows ‘Active Effect Collapsed’ in RW and Read More on the published page).
Seems to apply to Para.Pro/Header Pro inside Grummage and/or Sidebar containers but just on one page I edited). Can’t find controls in the usual places.
That page looks absolutely fine to me, no sign off those messages and the readmore is working correctly.
Perhaps its a browser cache issue on your machine?
Those messages are edit mode only and so RW/Stacks should never publish them. If they are there on some other page that I’ve not seen then it is a publishing error and republishing all files should fix it.