What could be the reasons for this abnormalities. Your thoughts.
It's not abnormalities, its simply because too many listed coins already present and there are still many projects that are adding on the list. Among these coins there are some that same with uses and idea so only the best among them will be notice. Some were considered shitcoin now as no update or development made. In my case I only focus on top alts or trade with active trading volume. Maybe many does that that makes those no volume in trading unnoticed.
Some exchanges already delisted some of altcoins before, soon more coins will be delisted and it is for better market.