All perfect praise be to Allaah, the Lord of the worlds. I testify that there is none worthy of worship except Allaah and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and messenger.
Making a vow is disliked in the Sharee'ah due to the relevant proofs in this regard. You made a conditional vow and became required to fulfill the vow once the matter upon which you made your vow conditional occurred.
If you did not intend to fast those days consecutively in your first and second vow, then you should fast the rest of the days, and you are not required to do anything else. If you did intend to fast those days consecutively, then you have to recommence the fast of the two vows and, according to the opinion of the majority of scholars, you are not required to offer an expiation.
Allaah Knows best.