One of the multiple submitted paper is published and others are withdrawn I have written one paper on mathematics and submitted it to 5 journals concurrently. Four of them accepted the paper and one asked to send the paper in their required format.

The paper contains one theorem and two applications. There was two argument gaps in the proof of the theorem. Only one journal caught that.

I have communicated with that journal and updated the paper throughout as below:


Changed the proof of the theorem entirely ,i.e. an alternative proof is provided, there is no similarity between the two proofs of the theorem.
Remove one of the applications and add a new application of that theorem.
Changed the way of applying of the theorem for the other application i.e firstly there was case distinction for the application, but later I removed the case distinction.


this paper is published in that journal and I have transferred the copyright agreement form to them and withdrawn the paper from other journals stating personal reasons. I am an amateur mathematician and I'm not pursuing any Phd degree.

Now my question is that what are the impacts may fall on the published paper in that journal as I have withdrawn all other manuscripts and they don't have the copy right agreement also, so is there any chances to claim the published article by them or they can force the editor of the journal which published the paper to retract the paper ?
Whatever you do in the future: do not submit the same manuscript to multiple (not even two) journals. 

If you have managed to get the manuscript accepted in one journal you need to immediately withdraw all others. You state you have given "personal reasons" whereas in reality you should have provided a serious excuse to the journals for wasting their time.

If you have withdrawn all other manuscripts there should not be any further impact on the one accepted for publication. You should learn from the experience and perhaps acquaint yourself better with the publication process so as to avoid mistakes such as these again. If repeated, it may affect you adversely by gaining a bad reputation or possibly being "banned" from certain journals by their editors. So most negative impacts, if any, will fall on you.