I think it is due to the bad internet connection at the time of answering the question and the researcher click on the button Add answer many times which add the same answer more than one time and the researcher don't know how to delete the extra answer from the upper button....edit.
First, “reads” don’t increase you score as much as you may think. There are some RG members with over 1/2 million reads and a score of less than 18!
in my case, sometimes I receive requests to answer questions or read articles and to be polite I try to answer them and in some cases I actually tell them that I had answered the question earlier. Some RG members rephrase questions!
RE: When I see the rediculus amount of recommendations a one word answer can receive, I understand why!
Yes, I myself have complained about that many times; the irony is that some people then respond with "I agree".
@Amir W. Al-Khafaji
RE: Sometimes one word is more profound than a thesis!
@Omar Z. Sharaf
RE: Very well-put, Dr. Amir!
One word answers are an utter waste of time! The worst part is that notifications get sent to question-followers. RG's Q&A is not intended as an opinion poll. If you like a question or answer but have nothing else to contribute just use the recommend button. If you don't like it, either ignore it or else give an explanation why. And don't just reply with short dogmatic slogans either. I don't care if you think we should just have faith or something equally inane.
If you attended a talk and put up your hand during the question period and just said "I agree" or "thank you" and left it at that, you would be considered daft. Why do that here?
When I had asked this question for do a simple orientation of some mistakes made in research gate question. I think when we asking a question for request the solution of a problem subject of question. no everybody can answer every question, each researcher can answer in his specialty. as it's detected from some answers that some researcher answers to question not in his specialty.
OK, I was tagging on to Stanley Wilkin's response, which I think is especially relevant regarding the repetition of pointless short answers, the implication being that the intention is to increase RG scores. I have seen questions where the questioner individually thanked many responders, and some of those responders thanked or expressed simple agreements with one another. Out of curiosity I checked the contributions of one of the responders and found he had given over 1000 answers, almost all of the many I sampled being no more than several words.
To be sure, there may be good longer answers that are repeated sometimes for good reason, either because the responder wanted to make slight changes or to bring an answer back to the forefront because the original is buried way back in the discussion. Perhaps in such cases, the responders don't realize that they can edit or delete the original answer. But I also think that in many instances such longer answers got buried in the first place because there is such a volume of short pointless answers.
So, to respond directly to your question's components:
to increase the number of readers? Yes, sometimes with good intentions, sometimes with the intention to raise RG scores.
to fix the ideas? Yes, sometimes a responder realizes he/she could've worded their answer better.
to increase the RG score? Yes, especially in the case of short unhelpful answers.
others possibilities? As someone pointed out, the responders may inadvertenly multiple-submit because of the internet connection.