nope that problem happened to me on two occasions (only my sader and priest have the warp, but only the priest ever saved the warp if i remember rightly).
it will fix itself by simply talking to the save npc to have it say that you have saved it. it will not ask you for money again tho. or as far as it happened about 2 times to me it never asked for money.
however you do have to enter the traditional way as in through the gate keeper or whatever that npc is called.
and the last time it happened to me was around April. i haven't touched my priest between July last year till about November. so yes it is a bug.
i do not know about any other warp npc tho. i do not use anthell warp tho i have it saved
i usually walk there. i guess i am just silly