this is something that's been bothering me for a while, but my b-string on my electric is being weird, whenever i move higher than the 7th fret, everything is getting too low, and when I checked the tuning, I saw that at the 12th fret it was A#, so a semitone down, and the harmonic has also moved a fret up (so no longer between 12 and 13 but between 13 and 14), could anybody help me, i would like to do it myself, I use a strat copy, and the string is on there for about a month or 2, maybe 3

Fender Jazzmaster
Boss DS-2
Digitech RP150 (with Line6 EX-1 Exp pedal)
Orange Crush 30R

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Intonation or truss rod adjustment is probably off. If your a beginner, i advise you to take it to a professional to set it up and if u want to do it yourself, research on intonation and truss road adjustment