My Lugol's Iodine becoming more "watery"

I made about 32oz 5% Lugols Iodine in early December 2012. I placed it all in 4oz glass amber bottles with a dropper top. I placed magnets on the bottle that I am using for daily use.

The (magetized bottle)dropper usually holds 16 drops, and it fills my empty capsule to the top. Today I notice that it took 22+ drops to fill the capsule! I filled the dropper once more, and again it held 22+ drops. The dropper isnt corroded nor looks like it is leaking. I took out another bottle without magnets, and that bottle held 16 drops as normal.

What is going on here? Are the magnets affecting the Lugols?

Summarize
Lugols w/ magnets: was 16 drops, now dropper is holding more.
Lugols w/o magnets: still holding 16 drops

***Off topic, does anyone know where I can get plastic lined caps for 4oz amber bottles, to replace the dropper tops? I have a feeling the rubber isn't going to last long.