When I opened a storage chest in my home, I noticed that it only showed me one furnishing, even though it is full (1 furnishing + 29 armor pieces). After some trial and error and disabling all addons, I found the following steps to reproduce the issue:
2. go to a guild store
3. open the sell tab
4. Selected the motif subcategory (not sure if that makes a difference)
5. go to a house
6. open a storage chest
It will now only show the furnishing, even when I select different filters. After opening the normal inventory the problem goes away.