A small amount of water is leaking out the bottom corner of the door, and the seal seems a bit loose there..

Chuck, most of the time, these tub seals have worn out, cracked, our broken, and then cause a leak. If it has just come out of the rail, you can definitely push it back in and see if it stays. If you would want to replace it, or it needs to be, I’ve added the part below with a link to purchase, as well as a simple video installation. Good luck!