Why do i keep getting mech boss spawning items please can someone

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Terraria Boss Summon Items Guide

Has anyone else encountered trouble with Bosses not spawning when triggered? : r/Terraria

I can't defeat any mechanical bosses. What am I doing wrong/What should I be doing differently? : r/Terraria

Terraria Boss Summon Items Guide

Does anyone know why I can't craft the mechanical boss summoners? : r/Terraria

Mobile - Unable to beat mechanical bosses. Help please

How do you make mechanical boss spawns?

Mobile - Unable to beat mechanical bosses. Help please

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How to Summon Bosses in Terraria