i have sent my revised paper to computers & education and now i received a rejection and only one reviewer comments but but before I received the remarks of the two reviewers and they appreciate the work (they recommand revise) now the reviewer is too harsh and the editor says The original reviewer also expressed serious concerns for the quality of revised paper presented here. So, I cannot accept this version at this moment. i do not know why i received only one reviewer comments. Is this normal: receiving rejection after revise and resubmit? and receiving one reviewer comments than 2?
received the remarks of the two reviewers and they appreciate the work (they recommand revise)
It seems that you misunderstood the "revise and resubmit" decision, I'm afraid: this means that the work is not acceptable as it is, otherwise the reviewers would usually recommend acceptation with (minor) revisions. "resubmit" means that they encourage you to improve the paper and submit it again, but there is no commitment of any kind that it will be accepted.
It's always frustrating to have a paper rejected, but you should focus on the reviewers comments: what kind of issues did they mention? Did they spot a lack of references/comparisons to the literature, or a lack of novelty? Did they suggest any additional work to perform or new directions to explore? By analyzing and understanding their criticisms, you can get valuable insight, improve your work and eventually get it published somewhere else.