Im sure others with more experience will chime in...

There is a product called liner lock, it comes in a roll and gets inserted to hold the liner in place. This had happened to me 13 yrs ago when they installed my above ground pool, while filling the liner pulled away, the installers came bac and used this and no more pulling from the track. If you can get it back in and use liner lock you could save a service call.



.http://www.intheswim.com/Pool-Liners...es/Liner-Lock/