whi I can't have a lake mushroom?

[Funeber]

ok, I have long-travelled to the lake mushroom location, I have picked up some mushroom, i have walked to the city for give the mushrooms to the NPC but... but... HEY! no mushroom in my inventory!
Well... I have re-long-travelled to the lake mushroom location, I have picked up some mushroom, i have opened my inventory and... no mushrooms! is a bug or a in-quest enigma?

[Lanarel]

I can think of a few things that explain this:
1. some items do not have (or have lost) their icon. Check your inventory for an empty slot with a quantity number, and right-click to see the description
2. When you do not have empty slots in your inventory, the system automatically looks inside any sacks you have, and if it finds room there, stores the item in it. Check inside all sacks you have (including glyph sacks) to see if they are there.
3. For some reason you did not get them, because inventory was full. This should be shown in your system window though, so you probably would have noticed that.

I think the second is most likely.

[Funeber]

I can think of a few things that explain this:
1. some items do not have (or have lost) their icon. Check your inventory for an empty slot with a quantity number, and right-click to see the description
2. When you do not have empty slots in your inventory, the system automatically looks inside any sacks you have, and if it finds room there, stores the item in it. Check inside all sacks you have (including glyph sacks) to see if they are there.
3. For some reason you did not get them, because inventory was full. This should be shown in your system window though, so you probably would have noticed that.

I think the second is most likely.

nope
no empty slots with quantity number, i have many empty slot and i not have sacks at all. System tells me Funeber have picked up a lake mushroom...

!!! EDIT !!!
if in the tavern i trade with the npc i can sell her the mushrooms! but my inventory is still not showing mushrooms... sigh...

*edit*

----------- "SOLVED"-----------
the only solution i have found for my problem is: sell all 'invisible items'.
i selled my 'invisible mushrooms' in the tavern, my 'invisible book' at the library and my 'invisible ores' to harnquist. now i have picked up some mushroom, and all works well...