Share 'Help!! Is my thermometer wrong?'

I cannot shout HELP!! loud enough. Can my thermometer be wrong? I am waiting for a infra red one, but until I have to use what I have. I am tempering Valrhona. Whilst seeding I try to let the temperature go down to 28C, but I cannot do it as the thermometer says it is still 31C, but the seed does not want to melt any more and the chocolate is very thick and starting to clump on the sides. What am…