I noticed my reputation on steemit got reduced from 25 to 16? what could be the reasons for this?

As per my advice i think when u have written any post on the steemit is good and very good.But u have copied that particular think from any where and direclty u have pasted on the steemit.
Because of this reason some devoting comes in the process.
As u have puted a images or vedio from online help you have to give reference to them about that particular thinks.
Steemit also checks your content of writing ales its copy paste work or the done people itself.
When highly devoting comes in your account your rank reduces.