In limits.c you find the advance portion,
while (GET_LEVEL(ch) < LVL_IMMORT &&
GET_EXP(ch) >= level_exp(GET_CLASS(ch), GET_LEVEL(ch) + 1))
The < LVL_IMMORT should be set to your NEW IMM level in structs.h.
as you indicated that they get to level 30 (the OLD IMM level 31) and go
to 99. Since it appears that you didn't change the LVL_IMMORT they make
it to IMM status at 31 and get advanced to your IMMORT level (99)?
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