Offical block explorer is same with umine's.
It doesn't matter. Wallet in official block explorer and wallet in umine may be both wrong.
My wallets are same with LycheeBit.
so short chain is right you claim ?
It's hard to say "this one is the good one".
Logically, the most spreaded one should be considered as the right one. But which ?
We need the dev to help us.