Brother Lx3817 why is my thread bunching up underneath my fabric

hi I'm trying to take in some clothes and noticed that my bobbin thread (white) is showing through on the top of my fabric. I'm unsure of what to do and these

Why Does Thread Keep Bunching Underneath My Fabric?

Why Does Thread Keep Bunching Underneath My Fabric?

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Why Does Thread Keep Bunching Underneath My Fabric?

User manual Brother JA1400 (English - 48 pages)

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Why Does Thread Keep Bunching Underneath My Fabric?

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