How do we know if the value of component cost is correct?

Following this step :

OPM Financials > Item Costs > Query for Item: FGTAALO725, Calendar: 2015, Period: AUG, Cost Type: PMAC

I have found a very large value of Component Cost on August.

Here is a comparison :

--Lower Level

Period     Usage Type       Component Class Code    Component Cost

-------- + --------------------- + ---------------------------------- + -------------------------+

MAY       Material            BKU                                2232.148567

JUN        Material            BKU                                2209.135289

JUL        Material            BKU                                2195.243546

AUG       Material            BKU                                88422.96335

Why are the value of Component Cost on August so large?

How do I know if the value of Component Cost on August is correct?

I'm in Oracle Applications : 12.1.3 RDBMS : 11.2.0.3.0

Thanks,

Joko