SD/100 vs StdDev(BB/100)

[live4therisk]

I have a question about these two stats

SD/100 and StdDev(BB/100)

Whats the difference between them?

Also I put SD/100 in a report, and its a constant variable of 2.5, there is no calculation being done, what does this mean?

Maybe its a custom stat, that was added accidentally I dont know about? Just wanted to make sure.

Thanks

Attached are screenshots

EDIT:

Ok apparently its a custom stat, maybe was added when I imported a custom report.

What was developer intending to do with wv2 as the expression?

[Flag_Hippo]

What was developer intending to do with wv2 as the expression?

That's just the name of the custom column used for the statistic. Go to the 'Columns' section and check the expression used for that custom column.