Hello Bersh. This can happen very occasionally since on the Quando II, the chainwheel and rear freewheel sprocket are slightly out of line, so if the chain flicks at a bump etc, and especially if it's gone a bit slack over time, it can hop off.
Some eZee models have rear adjusters, but not this one, so that's just a mistake, but you can safely put things right.
Slacken off the chainside wheel nut first sufficiently to leave the wheel loose but not so far out that it bears against the cables. Then slacken the other side nut.
Jiggle the wheel forward in the dropout grooves until you can put the chain back onto the freewheel. Then pull the wheel backwards until the chain is reasonable taut and tighten the left hand wheel nut (opposite side to chain) a little. Tighten the right hand one a little now while holding the wheel centrally between the frame tubes, and then wind back the pedals to see if there are any tight points on the chain. If so, readjust a bit, the aim is to have just about a half inch up and down play at most but with no tight points where the chain is stretched.
Once you have it set, finish tightening the wheel nuts, starting with the non-chainside first, since that is the registration for the internal motor alignment.
Finally, because you may have moved the wheel back, check the alignment of the brake pads on the rim sides, since they may be overlapping the tyre wall now and need readjusting.
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