Well sounds like its not a POT..Here are some general statements that do or dont pertain to your skills but is for everybody soldering their guitars.
I have seen some really poor solder jobs people have done without realizing that soldering takes a bit of practice. in fact they did'nt realize how bad it really was until I cleaned it up. Tell tale signs you need help.. are blobs of dull flat looking solder on your connections 5x's the thickness of the wire. You are reusing stuff you found in a drawer belonging to a previous relative who passed away...your solder is so thick, with a torch you can solder copper pipe in the basement..your solder is from Home Depot...All bad signs
1. Use the proper electrical solder in the proper thickness (see below).
2. have a soldering iron that is hot enough to melt the solder quickly onto the connection. Soldering the back of pots also requires a hot soldering Iron and a single application of solder which includes multiple connections, quick high heat and flux.
3. Solder flows from the tip to the connection, you do not melt the solder between the tip and the connection. So in short solder starts out being melted onto the tip and transfered to the connection
4. use flux on both sides of the connection before you start, even after the next step
5. Tin (add solder) the wire before you make the connection also use flux. The solder shoud just lightly coat the wire strands..Yes only use stranded wire for guitars.
The final result should be a bright shiny silver connection with minimal solder. A dull solder connection means it was too cold and is not a good electrical connection or a strong connection. A $100 soldering station will heat up a soldering iron in 40 seconds to up to 800 degrees and keep the temperature constant while you work. If you plan on doing many guitars its a good tool to invest in. Proper size and type of solder that isn't too old is required.
Kester Solder .032" round and 60/40 mix is a good place to start an interned search. If you like to Google most name brand solders can be found cheaply..There is a range of solder under what I just mentioned. A flux core is suggested even when using a paste flux, in case you need to add more solder to a joint you will not need to add additional flux to the joint.
I acquired my soldering skills over many years as a service technician as well as doing onsite board repairs. I can use junk irons and good irons to make a good connection its all in how you go about it, and if you have a bare minimum of the proper tools and supplies. A good joint take less time and effort.. really...