Tension. When sewing, the thread going from the needle is quite loose. The bobbin thread

Question

When sewing, the thread going from the needle is quite loose.  The bobbin thread seems to be sewing properly, but not the spool thread.  I have recently sewn on some terry cloth and had trouble going over a thick seam.  Today when I went to sew I had the problem ablve..  Any ideas?  I have not done anything other than re-threading the spool thread. Thank you