I teach music and I’ve seen this problem before when students attempt a barre chord, for this problem you want to make sure that the index finger is rolled a bit so that the bone of the finger is very close to the fret but not on it, with open chords I recommend a technique called anchoring, for example take a minor triad, put your index finger onto the c of the second string thus anchoring your position and then build the chord around that so when switching between chords you always have an anchor position to build from. Now obviously I recommend theory and standard notation over tabs so to get started memorize the open strings in standard notation this makes reading music for guitar much easier. Good luck!