Hello, in My Stardrew Valley game I'm playing with a friend and I'm the farmhand. I went to Robin 2 times to upgrade my Cabin to the 2nd level and I had all of the materials and bought it but she never built it so I but it again and she still didn't build it.
Are you leaving the game at all during from the time youve purchased the upgrade, also how many cabins are on the farm as the other cabin may have been upgraded instead.