Sorry to ask again but did you make it up to 5L with cooled boiled water?
The reason I ask is that if you leave the water out you would get about 1.2 as the S.G.
Assuming that the juices are both about 100g sugar per litre, so 200g in that, plus the added sugar gives 1.2kg in only 2L. That is 600g per litre of liquid(if you don't add any water) and we know 265g per litre adds about 0.1 to the S.G. So without adding water you'd have something like S.G.=1.22 which is what you said you measured. Just a thought.
It's It's currently at about 4.5L currently, I top it up after a couple of days after the initial rush of activity.
And the hydrometer is faulty, it's got a small crack in it. I dropped it awhile ago, but as it was in it's plastic casing I didn't think it had damaged it. Water / fluid is seeping into it.
When i started making wine i used to top up with cooled boiled water, then when i made my first 5 gallon brew i just used tap water to fill the bucket so boiling the water is not really necessary, i have read that it helps if your water is not the best, fortunately ours is fine.