Tech
Say its a 80 tick chart. If my mate starts just after me then his 80 tick bar and all further will look diff because my 80 tick bar will finish before his all the time . He will still have some ticks left on his bar before his new 80 tick bar starts. (they wont be in sync)
The only way they can be the same would be if you both logged on exactly the same time and your ticks would then start identicaly.
Sounds confusing but you try it, have two comps log on to the same instrument with one comp then the other, the prices will be the same but the shape of each tick bar will look diff. One might look like a doji the other a long candle.
Because they are not time frame bars eg 5min ect ect.
onemore