Object.keys results in an inconsistent/different ordering compared to the keys in Firebase Data

New to firebase. See the pick below, firebase returns these records in random order everytime. Is this a known behavior? I have googled this so much and every post that comes up is about randomizing the order. Also, you might find that timestamp key to be weird, that's a different debate but if you have a suggestion how I can structure this data better, please advise.

Thank you!

export const getMonthlyData = async (month, user) => {
  const performanceRef = firestore.doc(`performance/${user.id}`);
  const doc = await performanceRef.get();

    if(doc.exists) {
      const docArray = Object.keys(doc.data());
      console.log("Docs>>>>>>", docArray);
   }
}