Cobweb skill prevents interaction with items on the ground.

[spoletta]

In an area affected by the cobweb skill, it is impossible to click on items under it (like plants or stones), until the cobweb duration has expired.

An alternative solution to a fix, would be to add it to the spell description "Prevents interaction with items in the area", which would be really cool and in line with what you expect from a cobweb.

[Ostaff]

@spoletta

Quite sure that is as intended, as the webs are actually "holding" those items in place and thereby keeping you from picking them up or interacting with them.