Chaining specials issues & missing units

here is a list of champs that doesn't seem to connect specials 2 after a 5 hit combo in "hard" fights:
Dr. voodoo
Iron Man
Superior Iron man
its it just with me?

and second topic, i've saved 1011 units and opened 10 arena cristal that gave me 30 units but i only got to 1025, shame i didn't took screenshots to prove =/ but hope it get fixed