I am confused about two different stopping signs, used at same point in different Mushaf of Quran

I was reciting Surah Al Bqarah verse 256, at one point there is لا/قف and on other mushaf there is صلے لا means stop is prohibited While صلے means stop is preferable. I am so confused, please if someone can guide me. It happened earlier in one ayat earlier as well.