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I expect all frets to go from A to A# to B to C to C#... until G#
But I noticed that sometimes, on my guitar notes are skipped or come back to a lower notes that preceded it.
For example:
On the G string b3 go immediately to c4 on fret 4 and 5 respectively.
on the D string, it goes from b3 to c4 again on fret 9 and 10 respectively
fret 6 and 7 on the D string, goes from g#3 to a3
Thanks
In the note numbering system for octaves and registers the starting point is C, not A so B3 is followed ascending chromatically by C4 and G#3 is followed ascending chromatically by A3.
In note naming, C is the first note of each octave. Listed chromatically i.e. in semitone steps starting from octave 1 the names are: C1 C#1 D1 D#1 E1 F1 F#1 G1 G#1 A1 A#1 B1 C2 C#2 D2 D#2 E2 F2 F#2 G2 G#2 A2 A#2 B2 C3 ...
Shown on a piano keyboard:
If I understood your question correctly, the problem may be an uneven fretboard, combined with a low action (i.e. low bridge position, leaving the strings very near the fretboard)
In that situation if a particular fret is lower than the next (higher), when you press the string against the fret, the next (higher) fret will also be touching the string, and it will be as if you fretted the next fret.
This situation may be alleviated in a few different ways:
Lift the bridge, increasing the action (strings higher above the fretboard)
If the cause is a worn-out fret, it may have to be replaced (or all frets leveled down to a similar height).
If the cause is a fret that has partially popped out, gently hammer it back down (use some semi-soft material between hammer and fret, so you don't dent it, and be very gentle and progressive with the force applied. Or better, have it done by a competent person)
If the problem is excessive curvature of the neck, adjust the truss rod to make the neck straighter.
There are many good video on youtube showing how to tune up a guitar, watch several of them before attempting to do any major work by yourself.
