I'm not sure how I telegraph, but when I'm sparring and looking to counter there are a few glaring things that make my job easier: Lifting the elbows up to the side when jabbing or going for a straight right, these 2 punches should be straight down the centreline, this also rolls your shoulder naturally to provide a little defence to your head. Stepping in THEN jabbing - while this is ok some times, with amateurs you can almost bet this will be broken up into 2 separate movements, a lot of new fighters will step in as one movement THEN go for the jab as they are now in range, this makes it very predictable and easy to counter. Instead make sure you jab the same time you step, you can still be countered but it's not clear as day to your opponent. Always opening your attack with a jab - even I am guilty of this, watch a few amateur fights on YouTube and look for the specifically, almost everyone will begin their offence with a jab coming in, I find that being aware of this makes it very easy to set up a return attack, my go to move is this, they step in with a 1,2 I take a half step back dropping my weight to my back foot, and fire a 2 of my own, as they are coming forward with their own weight it adds to the power of my shot.
Usually it happens ether in your feet or shoulders. If you have a proper front pivot and know how to feint, you'll never telegraph your punches.
S**** that literally takes years of experience to learn to turn the hand over at the right time and taut your fist. KO artist Adonis Stevenson still turns his right over early.