Totally normal posts with positive comments being downvoted?

The last month or so I've noticed that newish (30min-2hrs ago) posts will show 0 upvotes even with several positive comments. I've had a lot of my stuff downvoted for reasons I don't understand, but I mean the posts I'm seeing so heavily downvoted are completely and utterly benign. Questions like "birthday ideas for my 40 year old mother?" With negative karma.

Anyone else noticing this? Is this a glitch, or possibly bot activity?