Loot disappaired

About 3 days ago I gathered all the material I had in my base from all chests and vaults to start building a new base for purge only, I had enough stuff for over 2k foundation and after building only a couple of stairs (30-40 foundation) I logged off until the next day. Day 2, simply logged on and placed too the materials in one of my vault and reset my attributes to do dungeons, and nothing else until next day. Day 3 which was today I wanted to stop farming and start building so I went to my vault to take the materials I previously stored , to my surprise they were gone, at first I thought maybe they’re in the vault next to the one I just checked so I looked inside that one as well and nothing…went through all my vaults and chest, benches, thralls, pets , I even double checked and went through the same 4 vaults 3-4 times each, I tried to relog change inventory sort by name and show either materials only or all items, nothing worked. I haven’t died a single time in the past week and there is nothing on event log , yet for some unknown reason I’m missing 30k black ice and 3k steel reinforcement…keep in mind I play solo on official PvE so my question is how?! what happened? It’s been bugging me for over an hour and I keep thinking about it , makes no sense at all…

Did the server crash or restart?

no, there was no rollback and even so I had those materials for days, looted most of it from a decayed base about a week ago.