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I think your issue is probably that the bias edges have warped and if you've got 6 seams coming together in the center they should have been twirled or possibly even pressed open. You're going to have to take it apart in the center, starch the snot out of it, possibly even trim if the fabric has stretched and then sew the seams back together. Stop 1/4 inch from the center on all but the last seam.
On my first try at hexagon kaleidoscope blocks, I was using a triangle ruler that wasn't a true 60 degrees but I didn't know it until I had to cut a 7th piece to make it fit. I had a big bubble in the center! Thankfully it was just one block and I quickly realized my ruler was the culprit.
Making star blocks is how I taught myself to quilt so the trick with stopping 1/4" from the center on all but the final seam and pressing that final one open is what worked for me. With 4 or even 6 seams you can usually get away with twirling the seams but it depends on how thick the fabric is. I have also clipped the center seam just a little and forced the seam to twirl.