Thanks for the report.
For the first bug, that's a known issue that happens when a teleporter is damaged by a demo charge and other explosives. We're working on that atm.
For the second bug, is it a small ufo? It's possible that you might've gotten the observer UFO, which has an upper level. If not then can you upload the save here?
For the warden armour, by adding it multiple times, do you mean in dropship or in garrison(unassigned)? The way the item system works, items are only counted as used if it is equipped in the dropship, if you equip garrisoned troops, it won't count because they item is only considered being used when in the dropship screen. If that's not the case, attaching the save will help a lot!