Reciting quran and having spelling mistakes doesn’t mean as if someone has ascribed false things to Allah (swt). Ascribing false things to Allah means a person says something from his own side while it has not mentioned in the Holy Quran doesn’t matter that was positive comment or negative.
Therefore don’t worry about that you may recite Quran( you are not doing any mistake intentionally)
Our Amal carries more value while we are fasting.