According to Jmp manual the standard option By Column in the Search/Find window works like this
And indeed, if there are several cells with the same value, Jmp uses this rule to step through the matching cells and at the end it starts a new round from the top left:
But:
So, if you want to be sure to find a matching cell, please take care that you select the right column (if there is a row selection) - or even easier: select no row or no cell at all.
TS-00078231
➥ Tiny-Traps-in-Jmp-and-JSL