While Allah repeatedly says that the creation of earth and heavens was in 6 days in suratul Furqan it adds up to 8 days(2+4+2); why is this?

Praise be to Allah, the Lord of the Worlds, and blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.

Allah created the heavens and the earth in six days as indicated in the Quran and the Hadith, Allah says (Interpretation of the meaning): {And indeed We created the heavens and the earth and all between them in six days and nothing of fatigue touched Us}. Allah also says (Interpretation of the meaning):{ Who created the heavens and the earth and all that is between them in six Days. Then He Istawâ (rose over) the Throne (in a manner that suits His Majesty). The Most Beneficent (Allâh)! Ask Him (O Prophet Muhammad SAW), (concerning His Qualities, His rising over His Throne, His creations, etc.), as He is Al-Khabîr (The All-Knower of everything i.e. Allâh)}. The Questioner may mean what is referred to in SURAH FUSSILAT. Allah says in it (Interpretation of the meaning): “Say (O Muhammad SAW): "Do you verily disbelieve in Him Who created the earth in two Days and you set up rivals (in worship) with Him? That is the Lord of the 'Alamîn (mankind, jinns and all that exists). This AYAH (verse) very clearly indicates that Allah created the earth in two days. Then Almighty says (Interpretation of the meaning): {He placed therein (i.e. the earth) firm mountains from above it, and He blessed it, and measured therein its sustenance (for its dwellers) in four Days equal (i.e. all these four 'days' were equal in the length of time), for all those who ask (about its creation). Then He Istawâ (rose over) towards the heaven when it was smoke, and said to it and to the earth: "Come both of you willingly or unwillingly." They both said: "We come, willingly." Then He completed and finished from their creation (as) seven heavens in two Days and He made in each heaven its affair} Some time a person would understand that total days are eight. This is a mistake. In fact, the earth is created in two days, as mentioned in the first AYAH (verse). Then He placed therein firm mountains and measured therein its sustenance etc. The amount of total days with creating the earth becomes four days only. He created heavens in two days. The total will be six days as mentioned in many AAYAT. Allah knows best.