Why am I not getting 100 % joystick movement in one direction?

After replacing one of the joysticks it registers 100% of a direction push in up,down and right but left only gets 95% to lower sometimes? Is it pins on the petentiometer or possibly something else?

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0