Kyla - here's my easiest suggestion - put something over it when it rains for the next few times. If its a large pot placed upside down, cover the drain holes so no rain gets in, remove it ASAP after the rain, if you do this for several weeks or a month, the plant will have time to grow deeper roots and less likely to rot in those conditions. I have some semps that I keep shaded with rocks, because they don't like the full sun in summer. And I have a whole container that I cover during extended rains, because I used just regular potting soil. Covering them and uncovering them works great for me!
My understanding is anytime you get something labelled 'mix' its seed grown, and therefor it will be different semps grown close together that will be from different seed - therefore each one is unique!
Cheers
