UnExpected Several SQLServer instances.

I Use:

Win 2012 and installed :

SharePoint 2013 Server-- at Server 1

SQLServer 2012 - at Server2

-  This SQL Server server (Server2)  have 2 Instances, one Named : SharePointInstace

and other one the default one , I used it for some other stuff.,(not related to SharePoint)

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It works just fine for while,

I added some features for SharePoint Server and service applications like : Reporting services ,

Today I checked the SharePoint Environment :

I found :

SharePoint Server : Three  Servers at the Servers page at the farm Server configurations at the Central Administration.

also I found the SharePoint Databases at the other Instance too with more database ,"Reporting Service Application Database".

I Double Check for the Database location for the reporting service application at "Service application management" at the Central administration website.

thank u for help