^^ Yes it was electrum - But when It never showed up in electrum so i exported the key and imported it to BC.I and now its like disappeared lol.
"exported" keys are not removed or deleted by Electrum. They are still kept in the Electrum wallet. Exporting simply displays the private key on the screen and/or allows you to save it to a file if required.
Find the Electrum wallet that contains this address and you will be able to export the private key again.