Star alignment - Skywatcher Explorer-150PDS

[Mike d]

Hi, 

I'm having trouble aligning my telescope. 

I can polar align fine, and I set the scope up in the direction of the pole star, and I use my DSLR (live view) to calibrate the stars whilst 2 star aligning. 

I then pick a star in the control handset and I check the star using an app is available (I have a view of it), when it is I confirm an dthe scope moves to align that star. 

However, the star is hardly in shot/view and the scope is pointing in a slightly different direction than the app. (star walk 2)

So I'm having all manner of difficulties aligning. 

 

Any help is much appreciated 

Thanks