Lately all the cookies I make seem to be too soft even though I store them properly,
why would this be?
Assuming that you are storing them properly, it's probably the recipe for the cookies. Here's some great info about what makes a cookie soft or crispy:
My other thought is that your cookies are underbaked. Maybe you should give them a few more minutes.
I don't know where you live, but baking on a very humid day will produce soft cookies. Try your recipe again on a cool dry day.