Poor thread balance

Troubleshooting and sewing defects
Incorrect positioning of thread interlacing or interlooping within the material or seam.
Also known as
Unbalanced stitch
Not to be confused with In lockstitch, the interlacing should normally lie within the material layers.
Translations
DE Fehlerhafte Fadenbalance
FR Mauvais équilibre des fils
ES Equilibrio incorrecto del hilo
IT Bilanciamento dei fili non corretto
CN 线迹平衡不良
VN Cân bằng chỉ kém