Would you like a list of all the Eastern texts that have been transmitted under the wrong person's name?
Just 3 will do (that are said to be from very prominent early church fathers (on the order of Augustine) )
Seems Catholics have a lot of this going on. But let's see about the Orthodox~
Actually, from what Fr. Peter quoted it sounds like this was a simple error not 'Catholics being told'. Two things to recall about medieval books:
a) Paper was rare and expensive. If you had a book that you filled with St. Augustine's sermons, then found at the end that you had a couple of blank pages, you didn't waste that valuable real estate--you found something else worth preserving, like some other sermons that might or might not be related to St. Augustine's and you copied them in as well.
b) All books were hand-copied. Overlooking one line like the line that said 'by Bishop Fulbert' in recopying was not unusual. Or could have even been done deliberately without any intention of actually obscuring authorship ('If I squeeze, I've just got room to this sermon on to this extra page--oops no room to add the byline, oh well ...).
This kind of misattribution (which is different from the deliberate forgery/pseudopigrapha represented by the Donations of Constantine or Pseudo-Dionysius) is not at all unusual in medieval texts and its not until the advent of modern printing and communications that scholars have had access to multiple copies of various works to disentangle man of them.