I've read in Wikipedia about +M strength of groups which goes:

–O - > –NH2 > –NHCOR > –OR > –OCOR > –Ph > –CH3 > –F > –Cl > –Br > –I

Now in every other website states that in terms of +M strength:

website->brainly

website->Chemistry libretexts

(And many more)

My question:

Can you please verify the series and explain the reason if -OR actually has less activity than -NHCOR?

• Also since in -NH of -NHCOR there is an EWG(Electron withdrawing group) which is -COR which should decrease the +M strength of the group appreciably.