At the moment the default share location for instagram is your personal facebook profile.
There is a easy way to change this actually without use a fancy app or going out and heading back your camera roll and into facebook and repost the image.. What a hassle…
So here is my guide to setting this up.
To share photos firstly open the app and head over to your profile tab and tap the gear icon in the top right.
Tap on Share Settings
Tap on Facebook
Tap on Share Photos To
Then you will be met with a screen with all the pages linked to your profile ( Note: it might ask for authentication )
In the future if you want to switch back to posting Instagram photos on your personal account, you’ll need to follow these steps again and select your Timeline instead of a Page.