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By the way, it's a great game – it's addictive. Basically, it's the same as messing around with quick battles in Heroes 3...
But right now, there's a problem with Ubisoft's server. It's giving out too many errors – they probably overloaded it.
Yes, there is this issue with the server. Right now, I've come to the conclusion that I'll play tomorrow, although I could play today too, but I've already played for about 2 hours, and now the glitches you mentioned have started.
Also, I want to add from the post I wrote on the Nival forum about how to register and play:
Well, for those who know English, you can even read the game rules here - http://www.heroesmini.com/howtoplay.php. But it's not necessary – everything is clear there anyway. It's better to register right away using this link - http://www.heroesmini.com/register.php (there you fill in your email, name, age, etc.). After registration, you don't need to wait for anything – you'll be immediately redirected to the page where you choose a Faction. After that, you can start creating your army. Drag the desired unit from the right into one of your 3 squads and change the number in the squad. After composing the army according to your finances, click "build army". Then, at the top, click "go to filed" or something like that. Well, and finally, either wait for an opponent to attack you, or look for someone yourself and attack – the "challenge" button is near the list of usernames of the players who are online.