I left my kit outside for a couple of days and had a similar observation. The temps were lows in the mid-40's to highs in the mid-60's; mid-60 when I did the test. The indicator came out sort of syrup-like and pooled on the bottom. Hadn't seen that before. I went ahead and did the test and it worked same as usual, meaning I got the result I expected. I did, however, have to mix it a little longer before starting the test.
Was your garage temperature in that range by chance? Or is it heated? If it's heated, none of this is relevant, of course.
I assumed that this was just a temperature effect on the viscosity, but that the test was still okay. But I'm curious what others say. I don't know much about these things.
Gary