So I just came back to my base to find it totally leveled.
When I hit notifications 3 things popped up. It said someone attacked me (but I couldn't see the name because the icon was glitched out covering it) then once more and the third attack was from a player Legeekguizmai, who I had battled with months ago at lower level. When I close notifications and hit repair, everything repaired instantly.
When I go to my attack log, it says Warrior895765 attacked me 4 times. That's not a player. Furthermore, Legeekguizmai doesn't have a base or OP in range to attack me.
Is this a case of hacking?