Not really a bug, per se.
Shamans (and all wis casters) get spells at 1, 5, 9, 14, 19 instead of 1, 4, 8, 12, 16, 20 like int casters do.
The 'level 4' shaman spell you've seen is there because later on (post-classic) EverQuest casters were given their spells at every level (so 1,2,3,4 and so on...).
In project1999, the level 4 spell you have IS a level 5 spell.
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