Thanks all for your comments.
I received a reply from Scirra Support Team as below if anyone interested to know more:
"I'm sorry but the arcade has some bugs that need fixing - we're working on a new version which will address all these issues. In the mean time I would recommend uploading it as a new game. If you are already attempting to upload a new game and encounter issues you can look into this topic (https://www.construct.net/en/forum/game-development/distribution-and-publishing-26/dropbox-discontinuing-renderin-116746) to find other websites where to upload your game."
I tried uploading my game on a few free webs and absolutely loved this one https://itch.io/ It is very simple and quick to use. I am still a big supporter of Scirra Aracde though with their LeaderBoard and Community. Looking forward to their new version of Construct 3.
Hope it helps.