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Ok, the solution was in the two lines with the buttons.
<div class="flex items-center gap-8">
<button class="btn-warning mt-4" @click="this.deleteInstruction(editInstruction)">Delete Instruction</button>
<button type="submit" class="btn-primary mt-4" @click='saveEditInstruction'>Save Instruction</button>
</div>
Changed to
<div class="flex items-center gap-8">
<button type="button" class="btn-warning mt-4" @click="this.deleteInstruction(editInstruction)">Delete Instruction</button>
<button type="submit" class="btn-primary mt-4" @click='saveEditInstruction'>Save Instruction</button>
</div>
Apparently not having the type="button" let it cascade to the save submit method.
Source:stackexchange.com