Tes5Edit found dirty records in a DLC twice in a row

[Aboogie1]

I was cleaning my DLC masters the other day in preparation for a new Skyrim install when something odd happened. I accidentally cleaned one of them again, a second time, after it had already been cleaned. Tes5Edit found more things to remove. What could have caused it to miss those things the first time? and does this mean that I should clean master files multiple times? I was cleaning them one at a time and following the master file cleaning directions.

[Nozzer66]

It's known thing. It's mentioned in the step guide here that dawnguard.esm may need to be cleaned twice. https://wiki.step-project.com/Dawnguard#Recommendations

[Nozzer66]

No, that one file's a special situation.

[Aboogie1]

@Nozzer66

 

So this is a known thing? Is there anything else important about it, or just that I need to clean it twice and not worry about it?

[Aboogie1]

Thank you Nozzer66. :)