Flat roof membrane not welded at edge of each layer, need help
No, it’s not normal for the edges to be loose. 

Poly glass is a self sealing modified bitumen roofing product. See here:

http://www.polyglass.com/public/COM/products/POLYFRESKO_G_SA.pdf

As you can see in Item #6 of the installation instructions, the seams are to be lapped 6” and side lapped 4”. 

I think it’s installed correctly. 

If there are loose edges you could have leaks, blow-off, etc. AND your warranty is void.