Why did the word "أهلونا" (ahlūna) appear with an extra waw in the verse: "The stragglers among the Bedouins will say to you, 'Our possessions and our families kept us busy, so ask forgiveness for us'"?

"Ahloona" is the plural of the word "ahl" (family/people), which is a singular noun denoting a collective. Its plural forms are "ahleena" in the accusative and genitive cases, and "ahloona" in the nominative case. "Ahloona" is considered an appendage to the sound masculine plural, and the waw (و) in it is a sign of plurality, not an extra letter.