Feed flooded with irrelevant contracts**

[#1]

My field is engineering, and have my categories set likewise. Out of curiosity I briefly added a few ''writing'' categories to see what the market was like in that field. I removed the writing categories, and now all of my categories are again solely engineering. However, my feed is still totally flooded with writing contracts. I have refreshed the page many times, logged out and back in many times, and i have deleted cookies and cache. I need these unrelated contracts to be removed from my feed as I cannot see contracts that I actually need. Help would be appreciated. 

[#2]

I don't even look at the general feed. There's enough dreck for me to squelch in my saved searches. Shame we can't do negative filtering.