Bunching and Looping (Bobbin Side)

This likely is related to thread tension. You might increase that adjustment a bit higher than the book settings. If that does not fix the problem, here are some additional considerations?

https://www.thesprucecrafts.com/fixing-bobbin-thread-bunching-looping-tangling-2978069

Thread Breaking Bunching Looping and Tangling All Problems ONE SOLUTION...

hi Sue.
Why does my bobbin thread keep bunching up? Check Your Tension Settings. Looping underneath the fabric usually occurs when there is not enough tension in the needle thread to pull the bobbin thread. Sometimes thread bunching can be caused by something as simple as the tension dial being inadvertently turned.
Sewing Machine Thread Bunching Up Here Why .
if you go to this link a little pop up will come up just close this down.
or try this one.

How to Fix that Tangled Nest of Bobbin Thread Under Your Sewing
or read up more at this link.
Why does my bobbin thread keep bunching up Google Search

hi Lois.
this is all i could find out.
Check Your Tension Settings. Looping underneath the fabric usually occurs when there is not enough tension in the needle thread to pull the bobbin thread. Sometimes thread bunching can be caused by something as simple as the tension dial being inadvertently turn.
or try this link.
WHY IS THREAD BUNCHING UNDERNEATH MY FABRIC
or this one,
Sewing Machine Thread Bunching Up Here Why .
if you go to this link a little window might open up in the middle of the page just close the little window down.
or this.

The bobbin thread is bunching up Google Search

not sure if this will help you...Check Your Tension Settings. Looping underneath the fabric usually occurs when there is not enough tension in the needle thread to pull the bobbin thread. Sometimesthread buching can be caused by something as simple as the tension dial being inadvertently turned.

WHY IS THREAD BUNCHING UNDERNEATH MY FABRIC ? ' eBay

www.ebay.co.uk/gds/WHY-IS-THREAD-BUNCHING-UNDERNEATH-MY.../g.html..
or you could go to this link and see if it helps you out.. thread keeps looping Google Search

bunching of thread under the material is an indication of insufficient tension of the needle thread
increase the needle tension until the threads meet at the center of the materialbeing sewn

It sounds like you have what is referred to as "thread nesting" or birdnesting. If the upper thread is actually creating a mess under the fabric, then the upper tension most likely needs to be tighter.

Here are some other suggestions:
Sewing Machine Thread Bunching Up Here Why

...

Basic Tips for All

1. Always turn the handwheel TOWARDS you (counter clockwise) as turning it in the opposite direction (away from you, clockwise) may knock the timing out requiring repair from a service center.
2. Always be sure your presser foot is in the DOWN position before sewing. Sewing with the presser foot in the up position will cause your thread to tangle and your bobbin to jam.
3. Change needles regularly (after 16 hours of use) as dull/weak needles can cause damage to your machine and fabric. Only use SINGER needles on your SINGER sewing machine.
4. Always be sure you are using the correct bobbin for your machine. Class 66, Class 15 and Class 15J bobbins look very similar. However, using the incorrect bobbin class in your machine can cause damage.

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This sounds a lot like you've forgotten to lower the presser foot. (this leaves the tension discs open and causes serious issues below the material.) Double check that and if still having issues post again.

Looping or bunching on on the bottom is a result of problems with the TOP TENSION.
Rethread the upper thread and adjust tension. Try again.

1. make sure your machine is threaded right.2. set the tension between 3 and 4 and play with the tension as you need it to adjust it.3. make sure the bobbin is threaded right.make sure to visit the site below; it has solutions to multiple problems and instructions how to thread the needle or bobbin. Good luck.htt://Fix Looping/Knotting Thread Fix Knotting/Bunching Thread Looping Bunching & Knotting Thread