Give @p (run simotaniously) are giving players 1/2 what they are supposed to give and become divided by players. I put a video on what happened at https://www.youtube.com/watch?v=rzYOF5O-x78
*Note: I ran this on realms
*Note: It only happens with 2 players
That's not a bug.
When powering a line of redstone the order in which each piece update (in the same game tick) is pretty much random.
Your circuit give you (because you are the nearest player) part of the stuff, than teleport you and the rest to your friend (beacause now HE is the nearest player).
Work as intended, fix your circuit