Latbraker

I filled our 15k gallon pool 2 weeks ago and love it. Recently I noticed the uneven water level on the tile and measured. There is a 1" difference of water level on tile 35' apart from deep to shallow end. The deep end has the higher water mark. Is this someting I need to worry about if it doesn't get worse? I think it was level when I filled it but honestly don't know. Thank you !