Can anyone tell me what's wrong with my cactus? I moved it for the picture, but it normally receives indirect light that is pretty bright. Thank you!

It looks okay to me... what is the problem? Try to provide at least some daily sun indoors for best results. Indirect indoor sun is usually not enough light for most cacti.

The brown at the base of the two, and they are not able to stand up on their own!

If the base is getting soft then it may be rotting. If that is the case then you can try to save the cactus by cutting across the stem through healthy tissue above the rot, then rooting the healthy cutting. Otherwise the rot will almost inevitably consume the plant (if that's what it is). Often situations like this are an alert to remind you to fine tune the way you're growing the plant, like maybe less water and more light.

Perfect thank you!!

Looks like its rotting all right. The center one looks like a goner. When you cut the tops off, cut until you find green tissue all the way to the center of the pieces. No brown! Let the pieces air dry for a week or so then place them, cut side to the soil, in new potting soil. Press down with your fingers so the cut sides are making good contact with the soil and then wait. Water sparingly until it roots. Then water sparingly so you don't need to do this too often.

Okay thank you so much!!!!! So so so helpful.