Why is my computer doing this?

[Rhiannon Edwards]

I don't know what I've done to change anything, but now, every time I open up the internet on my computer and click on a linked, it opens up in a new tab; where usually it would open in the current tab. I've been to the internet settings and found where i change it back, but i have selected the default as opening new links in the current tab, and it is still opening up in new tabs. I changed some other settings for the internet and they worked, so it is just this one setting that won't change. Please help?