Welcome Tamster Baby:
Janie and I have a Tammy too. She is about 10 years older but has the same interests.
Your desk must have been painted with latex enamel and has suffered a severe case of 'blocking and plating' which means the surface didn't have air flow over it and it became soft, making it stick to whatever is laid on it.
Tool Guy is correct in his observation; it needs to be stripped and repainted. Only, this time, use an oil based paint to eleminate the problem.