Trying to retrieve my BTC from a defunct exchange

So, I had few hundred dollars worth of bitcoin on a wallet on a now defunct exchange called local cryptos. I want to transfer these . I have downloaded a wallet backup from localcryptos which is a .json file. I have used a utility called wallet backup explorer from local cryptos to extract the private keys from this file in a text file and I am getting around 2700 lines of private keys.

Since trying to sweep this high amount of private keys will cost me a lot, I wanted to first import all my private keys to a wallet and then do a onchain consolidation transaction to another wallet.

I opened a new wallet on electrum and tried importing the private keys. It shows me holding only 17 USD worth of bitcoin.

Where am I going wrong?

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EDIT:

I had 0.0162 of btc in my local cryptos wallet.. After importing my private keys, electrum shows only 0.0006761btc... Also, the localcryptos website is still up, I can login and see the 0.0162 btc in my wallet still but sending and receiving arent working

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