Pool Bubbled over Winter

[crabtreed]

Pool Bubbled over winter somehow. It has come detached in one corner. I have not taken the cover all the way off yet. Just tested water temp and then noticed this. Is the liner ruined? What is my next step? Do i fill the pool all the way back up and see if that pushes out any of the bubbles?
I have a sump pump for ground water but it is not ran by a float. I have to manually turn it on. I have been running it.

 

[ajw22]

Do i fill the pool all the way back up and see if that pushes out any of the bubbles?

Yup.

I have a sump pump for ground water but it is not ran by a float. I have to manually turn it on. I have been running it.

Run it.

Wait for warm weather to let the liner stretch and see how it settles back.

You should drain very little water from a liner pool when winterizing so the pressure of the water in the pool can prevent that type of bulging.