im having a liner replaced and the walls bubbled at the bottom of the shallow end and they had to drain and reset it. now the bottom of the walls are not flush again maybe 5 inches away from walls a little better then before but I don't think that's normal. my old liner was flush around all the walls I think this liner is a bit to small the paper says its 20x39 is that normal for a 20x40 pool? (Grecian). this is not good I cant have these air pckets at the botoom of the walls there will be countless holes popped in the liner. im filling pool right now they cut the staircase out today but will be another day before water reaches the shallow end and I am afraid it will have to be drained again I don't think the weight of the water will push the liner in as it seems its already at its full stretch point any insight on this would really be great. thanks