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if the strings are new, they're probably just stretching out.
When you put on new strings next time, before you clamp them down, stretch them out by hand, just grab onto them and pull them (pull, don't tug, you don't want to damage the guitar) this should stretch them out, then re-tune them and do that until they don't go out of tune when you stretch them. Then just clamp them down.
_________________ tune low, play hard, and floor it!!!
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