Along with flipping the spool over, another option is to see if you have a different way/route to feed your thread.
Eg. My machine, the thread normally goes straight up from the spool,then left towards the machine.
My machine has an option that lets the thread feed through a small hole to the bottom right
of the spool, then straight up, then back left to the machine.
I've used that different routing when a spool has created issues ... and it worked!