When specifying the `-S` / `-H` flag _after_ the `-a` flag, the flag is ignored:

busybox sh -c 'ulimit -a -S | grep stack && ulimit -a -H | grep stack'
-s: stack size (kb)                8192
-s: stack size (kb)                8192

busybox sh -c 'ulimit -aS | grep stack && ulimit -aH | grep stack'
-s: stack size (kb)                8192
-s: stack size (kb)                8192


Changing the order to put the `-S` / `-H` _before_ `-a`, and the correct values are shown;


busybox sh -c 'ulimit -S -a | grep stack && ulimit -H -a | grep stack'
-s: stack size (kb)                8192
-s: stack size (kb)                unlimited

busybox sh -c 'ulimit -Sa | grep stack && ulimit -Ha | grep stack'
-s: stack size (kb)                8192
-s: stack size (kb)                unlimited