When winding a bobbin you need to re-thread the machine in a different way, it will need to go through a series of guides and a pre-set tension disk, if you have skipped this or not seated it in the 'disk' you can end up with a loopy bobbin. Refer to your manual for the correct method.

If you have pyramid shapes this is something your engineer should be able to address at your service, in the meantime guide the thread as you wind with your finger. a gentle pressure up and down should persuade your bobbin to wind evenly.