Oh!
I might not have explained it clearly..
I'm upvoting memes made by others, but when I check on them again, they don't have an upvote on them. Also, they don't appear in the "My Likes" section. Is that because I'm being downvoted?
If you just go back on the page it will not save your upvote. So I either upvote and go to the userpage ot imgflip main page and not hit return to previous page.
That's what I always do, but when I come back to their meme via not hitting the back button, my upvote disappears. Who knows, hopefully the mods will fix it. :)