TSSOP pads lifting when soldernig
My first thought is inferior board. It never happened to boards we purchased from a professional PCB shop.
The iron is also a suspect. 30W is not a particularly high value, but the fact that it isn't temperature controlled means that it becomes very hot, no matter how low-power it is. The iron's power determines how fast heat can be drained from the iron without dropping temperature, and SMT pads don't draw much heat, so the iron will be and remain too hot. A temperature controlled iron is a must for decent soldering, both SMT and PTH.