I didn't know how else to say it

I haven't changed string size. But my low E string is real loose and soft. Even when it's a in tune it's like it. Being like this means it comes out of tune easy and even when it's in tune it still sounds flat. I put a new low E on and it's still like it.

Does anyone know what it could be?

I forgot to say that it was fine before all of this.

I was wondering if it had something to do with the bridge.
have you checked the saddle and nut?
Signature? What's a signature?

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