All the wallets look exactly the same as this new one:
--snip--
Can anyone explain why?
Probably because most altcoins are just clones of clones of clones of the original bitcoin core implementation.
People pumping out new (scam)coins usually just clone an existing coin and change a couple parameters, maybe change the QT wallet a little bit, but they don't invest enought time to completely write a new wallet from scratch, so the end result is that most of those wallets look more or less like the implementation they were forked from. Sometimes you can even trace back which version of bitcoin core was initially cloned when you look at some of the features of the altcoin wallet.
PS: i'm not saying that all altcoins are scams, but a lot of them are either scams or worthless imho.