some shops behaving weirdly when connected to shared external storage

[fluxionary]

hi, now it's no longer the case with my mese buying shop, but the coal buying shop is green+empty when it uses additional storage + that storage is full + it overflows into the shop itself + the shop is full too (or possibly, when any shop is full regardless of its use of extra storage, but I haven't tested that)
--Original message follows--
your shop that might be buying mese crystals, is marked as "used" (green outline) but isn't selling anything. what should be going on here?