I don't know if this is the right section or not be here I go.

When I put a capo on the 4th fret of my acoustic today, it sounded way different than it did a couple months ago when I would put the capo on the same fret.

And my guitar was in standard tuning both times.
I know what my guitar sounds like tuned.
I guess I didn't make much sense, but basically when I put it on the 4th, it sounds like it would've on the 5th fret a month ago.

It could the fact my guitar is an utter sack of poop, who knows. =/
I think it's operator error. You are probably mistaken about the tuning. I suppose it could be an action and/or neck relief issue that is causing the 5th fret to supersede the 4th but I don't think that's the case. To check for this, simply remove the capo, play the 4th fret then the 5th fret on each string and see if they sound the same.
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That's odd that it would go higher in pitch without the neck warping so far back the strings buzzed. Have you changed strings? Using a different brand? Have you changed tuning references, like using an electronic tuner once and a pitch pipe another time? Are you positive you weren't tuned down a half step a few months ago?

Hate to hit you with so many questions, but tis a tough one...
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check the tuning...

the lowest string should be an E

put capo on 4th fret

lowest string should be a G# or Ab

put capo on 5th fret

Lowest string should be an A
i forget what a capo sounds like on any fret as soon as i take it off
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