If it's not condensation as Obsidian suggested, then it appears to me that you are pouring your salve into tins when it's still fully liquid. A thin layer of beeswax is solidifying on the top and making those spots. When I make a wax-based salve, I stir it continuously until the temperature is below the melt temperature of the wax, and then I put it in pots or jars.
"... 40 drops of homeopathic..."
Is this a water-based dilution? If so, it's not going to work in your anhydrous (no water) recipe. The water will evaporate, or it will drop to the bottom of the salve and become moldy, or both. And possibly cause the tin to rust. I really recommend you do not do this.
If you are making 2 liters of this salve at a time, I gather you are selling this product? It may be wiser to test your product for a longer time first until you have a reliable method and you know your product is safe and attractive. Far better for YOU to deal with mold or unappealing spots or rust than to have customers deal with these issues.