Royal Alpha 710ML Cash Register "thermal paper printing light" Questions

Thermal paper will only print on one side. if inserted backwards and your printer runs hot then it is possible for the light print to "bleed" through the back lightly. If that is not the problem, then

paper should feel reasonably thick and have a very shiny surface on one side (the print side). Secondly, the thermal head may be failing in the printer. The heads in the small cheap registers wear out