Clarks — Faulty gobi boots sole

Last year i purchased a pair of clarks gobi boots. During lockdown period i didn't wore them. Due to which the were left lying in the rack and when i took them out, their sole has melted down and has become very much sticky. The weird thing is that the sole has melted down but the same material on heel is perfectly fine. It is a rubber silicon sole. I hope you will look into this matter and help in getting them repaired.