https://wccftech.com/pubg-pc-players-receiving-bp-compensation-following-pc-1-0-update-restored-bps-can-earned-feb-9/

PUBG PC players will be receiving compensation for BP loss following the release of the game’s PC 1.0 patch.

According to the PUBG development team, an issue that occurred between the 1.0 launch on December 22, and the scheduled maintenance on December 27th, prevented Battle Points from being given out correctly.