Cannot decrypt message using other than first t keys in exact order.

[darklow]

If you generate keys with 2 of 3 for example and encrypt the message the only way to decrypt is using first 2 keys. It doesn't work if you use 1st and 3rd key or 2nd and 3rd. Is this intended? It also doesn't work if you switch 1st and 2nd keys.

This way it works:

./threshold.py --tshares 2 --nshares 3 --folder ./data
./threshold.py --pkfile ./data/public.csv  --msg 123 --outfile ./c.txt
./threshold.py --file ./data/secret.txt --t 2
 > Reconstructed private key: 76050385198008030720774189841050237388165536102195945104435015448943504304002
./threshold.py --decrypt 76050385198008030720774189841050237388165536102195945104435015448943504304002 --infile ./c.txt
 > 123

But if you try to shuffle secret.txt or use other keys rather than 1st and 2nd in such order, then in can't decrypt messages. Are there any solutions? Thanks.