I had been using BTC for a while now and I used to use Bitcoin Core in my system for all transactions, recently I had a problem with my computer and now I just thought let me use blockchain.info website.
But the private key which I had for my address in bitcoin core shows a different address in blockchain and I'm not able to see my balance.

Could anyone help or suggest me on this?

["Signature R"]

I'm not sure if this is the right section to ask this question.
I recently noticed a transaction with almost every transaction having the same "Signature R", this address belongs to segwit address.
But the strange part I notice for the same is there is no "Signature S", I actually used the Sean-Bradley's 2coin.org site to find details of the transactions.

Should the P2WSH transaction be without "Signature S"? Or, is it getting stored elsewhere??

I've the Public key which is
0x04 32 bytes X coordinate 32 bytes Y coordinate.
Is there a way we can get the original point value on the Elliptic curve of R?

I did convert the 32 bytes into integer and I believe the curve point is generated using the order of the base point, now can we remove the order of the base point and look at only the values on the curve?