Funnel web spiders not dissapearing

#1
I dont know if this is a bug or not but to me it seems like it is. The game starts with one or two funnel web spiders but like 20 mins in on towhead not tried the other map yet the funnel webs dont dissapear but more appear so my ants cant go anywhere without running into a spider, my game has over 15 funnel web spiders spawners all over the map and its not really playable, hopefully this is an easy fix.
 
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