Items that purport to be "Related research" are completely unrelated.
My item on Diptera is matched against medical cardiovascular research - what?
If the word "newsletter" is in your title then Researchgate randomly selects anything else with that word in the title.
Far better to base that list on tags
P.S. the reason for the additional question mark is that RG seems to want more than one - not very concise about it though