Nesting of thread on wrong side (bottom) is usually top thread tension too low. To be sure which thread is nesting try test sew with different color top thread. If its bobbin thread then theres likely a problem with bobbin thread tension. Check the bobbin thread has not escaped the tension spring. Try following link https://www.singer.com/troubleshooting-tips
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Nesting of thread on wrong side (bottom) is usually top thread tension too low.
To be sure which thread is nesting try test sew with different color top thread.
If its bobbin thread then theres likely a problem with bobbin thread tension. Check the bobbin thread has not escaped the tension spring.
Try following link
https://www.singer.com/troubleshooting-tips